Repository: FHIR/sushi
Pull request #1315 (2023-07-26 20:50:21)

Allow caret and insert rules to be applied to concepts within a ValueSet
Completes task [CIMPL-1130](https://standardhealthrecord.atlassian.net/browse/CIMPL-1130).

Some of the elements within `ValueSet.compose.include.concept` and `ValueSet.compose.exclude.concept` can't be reached using the normal concept component rules on a ValueSet. To access those elements, you can now use a caret rule with a path that is a contained concept. Similarly, you can insert a RuleSet at such a path. These rules are similar to the code caret rules and code insert rules used by CodeSystem, but since the `concept` elements are a flat list, the path has to be exactly once concept long.

A concept component rule with exactly one concept in it establishes a context for an indented rule to appear after it. So, these two rules:
```
* ZOO#hippo "Hippopotamus"
* ZOO#hippo insert DesignationRules("hipopótamo", #es)
```
are equivalent to these two rules:
```
* ZOO#hippo "Hippopotamus"
  * insert DesignationRules("hipopótamo", #es)
```

The grammar changes to support these rules resulted in some different parser errors in cases where commas are used to list concepts. Additionally, these rules represent a sort of weird case where a rule may set a context, but not itself be indented. Rather than change the set of rules that are allowed to be used in context operations, I added a flag to the context-operation functions so that errors relating to improper indents only get logged once.

mint-thompson: @jafeltra thank you for pointing out that case with the caret rule! I've added a test for that and resolved the issue.

Patch:
diff --git a/antlr/src/main/antlr/FSH.g4 b/antlr/src/main/antlr/FSH.g4
index 512481d..02b036e 100644
--- a/antlr/src/main/antlr/FSH.g4
+++ b/antlr/src/main/antlr/FSH.g4
@@ -26,7 +26,7 @@ invariantRule:      fixedValueRule | insertRule | pathRule;
 
 valueSet:           KW_VALUESET name vsMetadata* vsRule*;
 vsMetadata:         id | title | description;
-vsRule:             vsComponent | caretValueRule | insertRule;
+vsRule:             vsComponent | caretValueRule | codeCaretValueRule | insertRule | codeInsertRule;
 codeSystem:         KW_CODESYSTEM name csMetadata* csRule*;
 csMetadata:         id | title | description;
 csRule:             concept | codeCaretValueRule | codeInsertRule;
@@ -90,8 +90,7 @@ pathRule:           STAR path;
 
 // VALUESET COMPONENTS
 vsComponent:        STAR ( KW_INCLUDE | KW_EXCLUDE )? ( vsConceptComponent | vsFilterComponent );
-vsConceptComponent: code vsComponentFrom?
-                    | (code KW_AND)+ code vsComponentFrom;
+vsConceptComponent: code vsComponentFrom?;
 vsFilterComponent:  KW_CODES vsComponentFrom (KW_WHERE vsFilterList)?;
 vsComponentFrom:    KW_FROM (vsFromSystem (KW_AND vsFromValueset)? | vsFromValueset (KW_AND vsFromSystem)?);
 vsFromSystem:       KW_SYSTEM name;
diff --git a/src/export/ValueSetExporter.ts b/src/export/ValueSetExporter.ts
index 3b6980b..435526c 100644
--- a/src/export/ValueSetExporter.ts
+++ b/src/export/ValueSetExporter.ts
@@ -19,7 +19,7 @@ import {
   assignInstanceFromRawValue
 } from '../fhirtypes/common';
 import { isUri } from 'valid-url';
-import { flatMap } from 'lodash';
+import { flatMap, partition } from 'lodash';
 
 export class ValueSetExporter {
   constructor(private readonly tank: FSHTank, private pkg: Package, private fisher: MasterFisher) {}
@@ -210,6 +210,65 @@ export class ValueSetExporter {
     }
   }
 
+  private setConceptCaretRules(vs: ValueSet, rules: CaretValueRule[]) {
+    resolveSoftIndexing(rules);
+    for (const rule of rules) {
+      const splitConcept = rule.pathArray[0].split('#');
+      const system = splitConcept[0];
+      const code = splitConcept.slice(1).join('#');
+      const systemMeta = this.fisher.fishForMetadata(system, Type.CodeSystem);
+      let composeIndex =
+        vs.compose?.include?.findIndex(composeElement => {
+          return composeElement.system === system || composeElement.system === systemMeta?.url;
+        }) ?? -1;
+      let composeArray: string;
+      let composeElement: ValueSetComposeIncludeOrExclude;
+      let conceptIndex = -1;
+      if (composeIndex !== -1) {
+        composeArray = 'include';
+        composeElement = vs.compose.include[composeIndex];
+        conceptIndex = composeElement?.concept?.findIndex(concept => {
+          return concept.code === code;
+        });
+      }
+      if (conceptIndex === -1) {
+        composeIndex =
+          vs.compose?.exclude?.findIndex(composeElement => {
+            return composeElement.system === system;
+          }) ?? -1;
+        if (composeIndex !== -1) {
+          composeArray = 'exclude';
+          composeElement = vs.compose.exclude[composeIndex];
+          conceptIndex = composeElement?.concept?.findIndex(concept => {
+            return concept.code === code;
+          });
+        }
+      }
+
+      if (conceptIndex !== -1) {
+        if (rule.isInstance) {
+          const instanceExporter = new InstanceExporter(this.tank, this.pkg, this.fisher);
+          const instance = instanceExporter.fishForFHIR(rule.value as string);
+          if (instance == null) {
+            logger.error(
+              `Cannot find definition for Instance: ${rule.value}. Skipping rule.`,
+              rule.sourceInfo
+            );
+            continue;
+          }
+          rule.value = instance;
+        }
+        const fullPath = `compose.${composeArray}[${composeIndex}].concept[${conceptIndex}].${rule.caretPath}`;
+        setPropertyOnDefinitionInstance(vs, fullPath, rule.value, this.fisher);
+      } else {
+        logger.error(
+          `Could not find concept ${rule.pathArray[0]}, skipping rule.`,
+          rule.sourceInfo
+        );
+      }
+    }
+  }
+
   private filterValueToString(value: ValueSetFilterValue): string {
     if (value instanceof RegExp) {
       return value.source;
@@ -248,16 +307,20 @@ export class ValueSetExporter {
     }
     const vs = new ValueSet();
     this.setMetadata(vs, fshDefinition);
-    this.setCaretRules(
-      vs,
-      fshDefinition.rules.filter(rule => rule instanceof CaretValueRule) as CaretValueRule[]
+    const [conceptCaretRules, otherCaretRules] = partition(
+      fshDefinition.rules.filter(rule => rule instanceof CaretValueRule) as CaretValueRule[],
+      caretRule => {
+        return caretRule.pathArray.length > 0;
+      }
     );
+    this.setCaretRules(vs, otherCaretRules);
     this.setCompose(
       vs,
       fshDefinition.rules.filter(
         rule => rule instanceof ValueSetComponentRule
       ) as ValueSetComponentRule[]
     );
+    this.setConceptCaretRules(vs, conceptCaretRules);
     if (vs.compose && vs.compose.include.length == 0) {
       throw new ValueSetComposeError(fshDefinition.name);
     }
diff --git a/src/import/FSHErrorListener.ts b/src/import/FSHErrorListener.ts
index 2a8eb99..7024ee3 100644
--- a/src/import/FSHErrorListener.ts
+++ b/src/import/FSHErrorListener.ts
@@ -235,13 +235,17 @@ export class FSHErrorListener extends ErrorListener<Token> {
     // * onset[x], abatement[x] MS
     // > extraneous input 'abatement[x]' expecting {<EOF>, KW_ALIAS, KW_PROFILE, KW_EXTENSION,
     // > KW_INSTANCE, KW_INVARIANT, KW_VALUESET, KW_CODESYSTEM, KW_RULESET, KW_MAPPING, KW_LOGICAL, KW_RESOURCE}
-    // * #hippo, #crocodile , #emu from system ZOO
-    // > extraneous input '#crocodile' expecting {<EOF>, KW_ALIAS, KW_PROFILE, KW_EXTENSION,
-    // > KW_INSTANCE, KW_INVARIANT, KW_VALUESET, KW_CODESYSTEM, KW_RULESET, KW_MAPPING, KW_LOGICAL, KW_RESOURCE}
     // * codes from valueset FirstZooVS, SecondZooVS
     // > extraneous input 'SecondZooVS' expecting {<EOF>, KW_ALIAS, KW_PROFILE, KW_EXTENSION,
     // > KW_INSTANCE, KW_INVARIANT, KW_VALUESET, KW_CODESYSTEM, KW_RULESET, KW_MAPPING, KW_LOGICAL, KW_RESOURCE}
-    else if (/^extraneous input/.test(msg) && /,$/.test(oneTokenBack?.text)) {
+    // * #hippo, #crocodile , #emu from system ZOO
+    // > no viable alternative at input '\n* #hippo, #crocodile ,'
+    // * #hippo, #crocodile, #emu from system ZOO
+    // > no viable alternative at input '\n* #hippo, #crocodile, #emu from'
+    else if (
+      (/^extraneous input/.test(msg) || /^no viable alternative at input '/.test(msg)) &&
+      (/,$/.test(oneTokenBack?.text) || /,$/.test(twoTokensBack?.text))
+    ) {
       message = "Using ',' to list items is no longer supported. Use 'and' to list multiple items.";
     }
 
diff --git a/src/import/FSHImporter.ts b/src/import/FSHImporter.ts
index 7d57864..da607ad 100644
--- a/src/import/FSHImporter.ts
+++ b/src/import/FSHImporter.ts
@@ -1171,16 +1171,42 @@ export class FSHImporter extends FSHVisitor {
     }
     if (ctx.caretValueRule()) {
       const rule = this.visitCaretValueRule(ctx.caretValueRule());
-      if (rule.path) {
+      if (ctx.caretValueRule().path()) {
         logger.error(
           'Caret rule on ValueSet cannot contain path before ^, skipping rule.',
           rule.sourceInfo
         );
       } else {
-        return this.visitCaretValueRule(ctx.caretValueRule());
+        // if this rule is indented, it may have a concept context
+        // but it never needs a regular path.
+        rule.path = '';
+        return rule;
+      }
+    } else if (ctx.codeCaretValueRule()) {
+      const rule = this.visitCodeCaretValueRule(ctx.codeCaretValueRule(), true);
+      // the rule needs to have a caretPath, a value, and a pathArray with one element.
+      // various syntax errors may lead to some of these values being missing.
+      // the appropriate error has already been logged by FSHErrorHandler.
+      if (rule.pathArray.length > 1) {
+        logger.error(
+          'Only one concept may be listed before a caret rule on a ValueSet.',
+          rule.sourceInfo
+        );
+      } else if (rule.caretPath != null && rule.value != null) {
+        return rule;
       }
     } else if (ctx.insertRule()) {
-      return this.visitInsertRule(ctx.insertRule());
+      return this.visitInsertRule(ctx.insertRule(), true);
+    } else if (ctx.codeInsertRule()) {
+      const rule = this.visitCodeInsertRule(ctx.codeInsertRule(), true);
+      if (rule.pathArray.length > 1) {
+        logger.error(
+          'Only one concept may be listed before an insert rule on a ValueSet.',
+          rule.sourceInfo
+        );
+      } else {
+        return rule;
+      }
     }
   }
 
@@ -1240,9 +1266,10 @@ export class FSHImporter extends FSHVisitor {
     pathArray: string[],
     parentCtx: ParserRuleContext,
     isPathRule = false,
-    isInstanceRule = false
+    isInstanceRule = false,
+    suppressError = false
   ): string[] {
-    return this.prependPathContext(pathArray, parentCtx, isPathRule, isInstanceRule);
+    return this.prependPathContext(pathArray, parentCtx, isPathRule, isInstanceRule, suppressError);
   }
 
   visitPath(ctx: pc.PathContext): string {
@@ -1711,10 +1738,17 @@ export class FSHImporter extends FSHVisitor {
     return caretValueRule;
   }
 
-  visitCodeCaretValueRule(ctx: pc.CodeCaretValueRuleContext): CaretValueRule {
+  // when parsing a ValueSet, we need to keep the system.
+  // in all other cases, the system is not needed.
+  visitCodeCaretValueRule(ctx: pc.CodeCaretValueRuleContext, keepSystem = false): CaretValueRule {
     const localCodePath = ctx.CODE()
       ? ctx.CODE().map(code => {
-          return this.parseCodeLexeme(code.getText(), ctx).code;
+          const parsedCode = this.parseCodeLexeme(code.getText(), ctx);
+          if (keepSystem) {
+            return `${parsedCode.system ?? ''}#${parsedCode.code}`;
+          } else {
+            return parsedCode.code;
+          }
         })
       : [];
     const fullCodePath = this.getArrayPathWithContext(localCodePath, ctx);
@@ -1724,13 +1758,13 @@ export class FSHImporter extends FSHVisitor {
       .withFile(this.currentFile);
     caretRule.pathArray = fullCodePath;
     // Get the caret path, but slice off the starting ^
-    caretRule.caretPath = this.visitCaretPath(ctx.caretPath()).slice(1);
+    caretRule.caretPath = this.visitCaretPath(ctx.caretPath())?.slice(1);
     caretRule.value = this.visitValue(ctx.value());
     // for numbers and booleans, keep the raw value to handle cases where an Instance id looks like a number
-    if (ctx.value().NUMBER()) {
+    if (ctx.value()?.NUMBER()) {
       caretRule.rawValue = ctx.value().NUMBER().getText();
     }
-    if (ctx.value().bool()) {
+    if (ctx.value()?.bool()) {
       caretRule.rawValue = ctx.value().bool().getText();
     }
     caretRule.isInstance =
@@ -1760,22 +1794,34 @@ export class FSHImporter extends FSHVisitor {
     return pathRule;
   }
 
-  visitCodeInsertRule(ctx: pc.CodeInsertRuleContext): InsertRule {
+  // when parsing a ValueSet, we need to keep the system.
+  // in all other cases, the system is not needed.
+  visitCodeInsertRule(ctx: pc.CodeInsertRuleContext, keepSystem = false): InsertRule {
     const insertRule = new InsertRule('')
       .withLocation(this.extractStartStop(ctx))
       .withFile(this.currentFile);
     const localCodePath = ctx.CODE().map(code => {
-      return this.parseCodeLexeme(code.getText(), ctx).code;
+      const parsedCode = this.parseCodeLexeme(code.getText(), ctx);
+      if (keepSystem) {
+        return `${parsedCode.system ?? ''}#${parsedCode.code}`;
+      } else {
+        return parsedCode.code;
+      }
     });
     const fullCodePath = this.getArrayPathWithContext(localCodePath, ctx);
     insertRule.pathArray = fullCodePath;
     return this.applyRuleSetParams(ctx, insertRule);
   }
 
-  visitInsertRule(ctx: pc.InsertRuleContext): InsertRule {
-    const insertRule = new InsertRule(this.getPathWithContext(this.visitPath(ctx.path()), ctx))
+  visitInsertRule(ctx: pc.InsertRuleContext, withPathArray = false): InsertRule {
+    const localPath = this.visitPath(ctx.path());
+    const fullPathArray = this.getArrayPathWithContext(localPath === '' ? [] : [localPath], ctx);
+    const insertRule = new InsertRule(fullPathArray.join('.'))
       .withLocation(this.extractStartStop(ctx))
       .withFile(this.currentFile);
+    if (withPathArray) {
+      insertRule.pathArray = fullPathArray;
+    }
     return this.applyRuleSetParams(ctx, insertRule);
   }
 
@@ -1990,6 +2036,20 @@ export class FSHImporter extends FSHVisitor {
       [vsComponent.concepts, vsComponent.from] = this.visitVsConceptComponent(
         ctx.vsConceptComponent()
       );
+      if (vsComponent.concepts.length === 1) {
+        // set context... but if this is indented, this will produce the "don't indent me" error a second time
+        // so, we set a flag to tell it to not produce that error.
+        this.getArrayPathWithContext(
+          [`${vsComponent.concepts[0].system}#${vsComponent.concepts[0].code}`],
+          ctx,
+          false,
+          false,
+          true
+        );
+      } else {
+        // reset the context
+        this.getArrayPathWithContext([], ctx, false, false, true);
+      }
     } else if (ctx.vsFilterComponent()) {
       vsComponent = new ValueSetFilterComponentRule(inclusion)
         .withLocation(this.extractStartStop(ctx))
@@ -1997,6 +2057,8 @@ export class FSHImporter extends FSHVisitor {
       [vsComponent.filters, vsComponent.from] = this.visitVsFilterComponent(
         ctx.vsFilterComponent()
       );
+      // reset the context
+      this.getArrayPathWithContext([], ctx, false, false, true);
     }
     return vsComponent;
   }
@@ -2006,41 +2068,26 @@ export class FSHImporter extends FSHVisitor {
     const from: ValueSetComponentFrom = ctx.vsComponentFrom()
       ? this.visitVsComponentFrom(ctx.vsComponentFrom())
       : {};
-    if (ctx.code().length === 1) {
-      const singleCode = this.visitCode(ctx.code()[0]);
-      if (singleCode.system && from.system) {
-        logger.error(`Concept ${singleCode.code} specifies system multiple times`, {
-          file: this.currentFile,
-          location: this.extractStartStop(ctx)
-        });
-      } else if (singleCode.system) {
-        from.system = singleCode.system;
-        concepts.push(singleCode);
-      } else if (from.system) {
-        singleCode.system = from.system;
-        concepts.push(singleCode);
-      } else {
-        logger.error(
-          `Concept ${singleCode.code} must include system as "SYSTEM#CONCEPT" or "#CONCEPT from system SYSTEM"`,
-          {
-            file: this.currentFile,
-            location: this.extractStartStop(ctx)
-          }
-        );
-      }
-    } else if (ctx.code().length > 1) {
-      if (from.system) {
-        ctx.code().forEach(code => {
-          const newCode = this.visitCode(code);
-          newCode.system = from.system;
-          concepts.push(newCode);
-        });
-      } else {
-        logger.error('System is required when listing concepts in a value set component', {
+    const singleCode = this.visitCode(ctx.code());
+    if (singleCode.system && from.system) {
+      logger.error(`Concept ${singleCode.code} specifies system multiple times`, {
+        file: this.currentFile,
+        location: this.extractStartStop(ctx)
+      });
+    } else if (singleCode.system) {
+      from.system = singleCode.system;
+      concepts.push(singleCode);
+    } else if (from.system) {
+      singleCode.system = from.system;
+      concepts.push(singleCode);
+    } else {
+      logger.error(
+        `Concept ${singleCode.code} must include system as "SYSTEM#CONCEPT" or "#CONCEPT from system SYSTEM"`,
+        {
           file: this.currentFile,
           location: this.extractStartStop(ctx)
-        });
-      }
+        }
+      );
     }
     return [concepts, from];
   }
@@ -2194,10 +2241,11 @@ export class FSHImporter extends FSHVisitor {
     path: string[],
     parentCtx: ParserRuleContext,
     isPathRule: boolean,
-    isInstanceRule: boolean
+    isInstanceRule: boolean,
+    suppressError: boolean
   ): string[] {
     try {
-      const location = this.extractStartStop(parentCtx);
+      const location = this.extractStartStop(parentCtx, suppressError);
       const currentIndent = location.startColumn - DEFAULT_START_COLUMN;
       const contextIndex = currentIndent / INDENT_WIDTH;
 
@@ -2241,7 +2289,7 @@ export class FSHImporter extends FSHVisitor {
 
       // Otherwise, get the context based on the indent level.
       const currentContext = this.pathContext[contextIndex - 1];
-      if (currentContext.length === 0) {
+      if (currentContext.length === 0 && !suppressError) {
         logger.error(
           'Rule cannot be indented below rule which has no path. The rule will be processed as if it is not indented.',
           { location, file: this.currentFile }
@@ -2416,7 +2464,7 @@ export class FSHImporter extends FSHVisitor {
     }
   }
 
-  private extractStartStop(ctx: ParserRuleContext): TextLocation {
+  private extractStartStop(ctx: ParserRuleContext, suppressError = false): TextLocation {
     if (pc.isStarContext(ctx)) {
       const location = {
         startLine: ctx.STAR().symbol.line + 1,
@@ -2425,6 +2473,7 @@ export class FSHImporter extends FSHVisitor {
         endColumn: ctx.stop.stop - ctx.stop.start + ctx.stop.column + 1
       };
       if (
+        !suppressError &&
         !(pc.containsPathContext(ctx) || pc.containsCodePathContext(ctx)) &&
         location.startColumn - DEFAULT_START_COLUMN > 0
       ) {
diff --git a/src/import/generated/FSH.interp b/src/import/generated/FSH.interp
index e090328..85a699d 100644
--- a/src/import/generated/FSH.interp
+++ b/src/import/generated/FSH.interp
@@ -277,4 +277,4 @@ mostAlphaKeywords
 
 
 atn:
-[4, 1, 89, 838, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 2, 3, 7, 3, 2, 4, 7, 4, 2, 5, 7, 5, 2, 6, 7, 6, 2, 7, 7, 7, 2, 8, 7, 8, 2, 9, 7, 9, 2, 10, 7, 10, 2, 11, 7, 11, 2, 12, 7, 12, 2, 13, 7, 13, 2, 14, 7, 14, 2, 15, 7, 15, 2, 16, 7, 16, 2, 17, 7, 17, 2, 18, 7, 18, 2, 19, 7, 19, 2, 20, 7, 20, 2, 21, 7, 21, 2, 22, 7, 22, 2, 23, 7, 23, 2, 24, 7, 24, 2, 25, 7, 25, 2, 26, 7, 26, 2, 27, 7, 27, 2, 28, 7, 28, 2, 29, 7, 29, 2, 30, 7, 30, 2, 31, 7, 31, 2, 32, 7, 32, 2, 33, 7, 33, 2, 34, 7, 34, 2, 35, 7, 35, 2, 36, 7, 36, 2, 37, 7, 37, 2, 38, 7, 38, 2, 39, 7, 39, 2, 40, 7, 40, 2, 41, 7, 41, 2, 42, 7, 42, 2, 43, 7, 43, 2, 44, 7, 44, 2, 45, 7, 45, 2, 46, 7, 46, 2, 47, 7, 47, 2, 48, 7, 48, 2, 49, 7, 49, 2, 50, 7, 50, 2, 51, 7, 51, 2, 52, 7, 52, 2, 53, 7, 53, 2, 54, 7, 54, 2, 55, 7, 55, 2, 56, 7, 56, 2, 57, 7, 57, 2, 58, 7, 58, 2, 59, 7, 59, 2, 60, 7, 60, 2, 61, 7, 61, 2, 62, 7, 62, 2, 63, 7, 63, 2, 64, 7, 64, 2, 65, 7, 65, 2, 66, 7, 66, 2, 67, 7, 67, 2, 68, 7, 68, 2, 69, 7, 69, 2, 70, 7, 70, 2, 71, 7, 71, 2, 72, 7, 72, 2, 73, 7, 73, 2, 74, 7, 74, 2, 75, 7, 75, 2, 76, 7, 76, 2, 77, 7, 77, 2, 78, 7, 78, 2, 79, 7, 79, 2, 80, 7, 80, 2, 81, 7, 81, 2, 82, 7, 82, 2, 83, 7, 83, 2, 84, 7, 84, 2, 85, 7, 85, 2, 86, 7, 86, 2, 87, 7, 87, 2, 88, 7, 88, 2, 89, 7, 89, 2, 90, 7, 90, 1, 0, 5, 0, 184, 8, 0, 10, 0, 12, 0, 187, 9, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 203, 8, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 3, 1, 3, 4, 3, 213, 8, 3, 11, 3, 12, 3, 214, 1, 3, 5, 3, 218, 8, 3, 10, 3, 12, 3, 221, 9, 3, 1, 4, 1, 4, 1, 4, 1, 4, 5, 4, 227, 8, 4, 10, 4, 12, 4, 230, 9, 4, 1, 4, 5, 4, 233, 8, 4, 10, 4, 12, 4, 236, 9, 4, 1, 5, 1, 5, 1, 5, 1, 5, 5, 5, 242, 8, 5, 10, 5, 12, 5, 245, 9, 5, 1, 5, 5, 5, 248, 8, 5, 10, 5, 12, 5, 251, 9, 5, 1, 6, 1, 6, 1, 6, 5, 6, 256, 8, 6, 10, 6, 12, 6, 259, 9, 6, 1, 6, 5, 6, 262, 8, 6, 10, 6, 12, 6, 265, 9, 6, 1, 7, 1, 7, 1, 7, 1, 7, 3, 7, 271, 8, 7, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 3, 8, 283, 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0, 650, 651, 5, 54, 0, 0, 651, 652, 3, 146, 73, 0, 652, 656, 5, 66, 0, 0, 653, 655, 3, 150, 75, 0, 654, 653, 1, 0, 0, 0, 655, 658, 1, 0, 0, 0, 656, 654, 1, 0, 0, 0, 656, 657, 1, 0, 0, 0, 657, 659, 1, 0, 0, 0, 658, 656, 1, 0, 0, 0, 659, 664, 3, 178, 89, 0, 660, 661, 5, 40, 0, 0, 661, 663, 3, 178, 89, 0, 662, 660, 1, 0, 0, 0, 663, 666, 1, 0, 0, 0, 664, 662, 1, 0, 0, 0, 664, 665, 1, 0, 0, 0, 665, 667, 1, 0, 0, 0, 666, 664, 1, 0, 0, 0, 667, 669, 5, 58, 0, 0, 668, 670, 7, 4, 0, 0, 669, 668, 1, 0, 0, 0, 669, 670, 1, 0, 0, 0, 670, 121, 1, 0, 0, 0, 671, 672, 5, 54, 0, 0, 672, 673, 3, 146, 73, 0, 673, 123, 1, 0, 0, 0, 674, 676, 5, 54, 0, 0, 675, 677, 7, 7, 0, 0, 676, 675, 1, 0, 0, 0, 676, 677, 1, 0, 0, 0, 677, 680, 1, 0, 0, 0, 678, 681, 3, 126, 63, 0, 679, 681, 3, 128, 64, 0, 680, 678, 1, 0, 0, 0, 680, 679, 1, 0, 0, 0, 681, 125, 1, 0, 0, 0, 682, 684, 3, 158, 79, 0, 683, 685, 3, 130, 65, 0, 684, 683, 1, 0, 0, 0, 684, 685, 1, 0, 0, 0, 685, 127, 1, 0, 0, 0, 686, 687, 5, 46, 0, 0, 687, 690, 3, 130, 65, 0, 688, 689, 5, 47, 0, 0, 689, 691, 3, 136, 68, 0, 690, 688, 1, 0, 0, 0, 690, 691, 1, 0, 0, 0, 691, 129, 1, 0, 0, 0, 692, 703, 5, 31, 0, 0, 693, 696, 3, 132, 66, 0, 694, 695, 5, 38, 0, 0, 695, 697, 3, 134, 67, 0, 696, 694, 1, 0, 0, 0, 696, 697, 1, 0, 0, 0, 697, 704, 1, 0, 0, 0, 698, 701, 3, 134, 67, 0, 699, 700, 5, 38, 0, 0, 700, 702, 3, 132, 66, 0, 701, 699, 1, 0, 0, 0, 701, 702, 1, 0, 0, 0, 702, 704, 1, 0, 0, 0, 703, 693, 1, 0, 0, 0, 703, 698, 1, 0, 0, 0, 704, 131, 1, 0, 0, 0, 705, 706, 5, 49, 0, 0, 706, 707, 3, 144, 72, 0, 707, 133, 1, 0, 0, 0, 708, 709, 5, 48, 0, 0, 709, 714, 3, 144, 72, 0, 710, 711, 5, 38, 0, 0, 711, 713, 3, 144, 72, 0, 712, 710, 1, 0, 0, 0, 713, 716, 1, 0, 0, 0, 714, 712, 1, 0, 0, 0, 714, 715, 1, 0, 0, 0, 715, 135, 1, 0, 0, 0, 716, 714, 1, 0, 0, 0, 717, 722, 3, 138, 69, 0, 718, 719, 5, 38, 0, 0, 719, 721, 3, 138, 69, 0, 720, 718, 1, 0, 0, 0, 721, 724, 1, 0, 0, 0, 722, 720, 1, 0, 0, 0, 722, 723, 1, 0, 0, 0, 723, 137, 1, 0, 0, 0, 724, 722, 1, 0, 0, 0, 725, 726, 3, 144, 72, 0, 726, 728, 3, 140, 70, 0, 727, 729, 3, 142, 71, 0, 728, 727, 1, 0, 0, 0, 728, 729, 1, 0, 0, 0, 729, 139, 1, 0, 0, 0, 730, 731, 7, 8, 0, 0, 731, 141, 1, 0, 0, 0, 732, 738, 3, 158, 79, 0, 733, 738, 5, 42, 0, 0, 734, 738, 5, 43, 0, 0, 735, 738, 5, 71, 0, 0, 736, 738, 5, 58, 0, 0, 737, 732, 1, 0, 0, 0, 737, 733, 1, 0, 0, 0, 737, 734, 1, 0, 0, 0, 737, 735, 1, 0, 0, 0, 737, 736, 1, 0, 0, 0, 738, 143, 1, 0, 0, 0, 739, 740, 7, 9, 0, 0, 740, 145, 1, 0, 0, 0, 741, 745, 5, 73, 0, 0, 742, 745, 5, 60, 0, 0, 743, 745, 3, 180, 90, 0, 744, 741, 1, 0, 0, 0, 744, 742, 1, 0, 0, 0, 744, 743, 1, 0, 0, 0, 745, 147, 1, 0, 0, 0, 746, 747, 5, 70, 0, 0, 747, 149, 1, 0, 0, 0, 748, 749, 7, 10, 0, 0, 749, 151, 1, 0, 0, 0, 750, 751, 7, 11, 0, 0, 751, 153, 1, 0, 0, 0, 752, 765, 5, 58, 0, 0, 753, 765, 5, 59, 0, 0, 754, 765, 5, 60, 0, 0, 755, 765, 5, 64, 0, 0, 756, 765, 5, 65, 0, 0, 757, 765, 3, 166, 83, 0, 758, 765, 3, 172, 86, 0, 759, 765, 3, 158, 79, 0, 760, 765, 3, 162, 81, 0, 761, 765, 3, 164, 82, 0, 762, 765, 3, 176, 88, 0, 763, 765, 3, 144, 72, 0, 764, 752, 1, 0, 0, 0, 764, 753, 1, 0, 0, 0, 764, 754, 1, 0, 0, 0, 764, 755, 1, 0, 0, 0, 764, 756, 1, 0, 0, 0, 764, 757, 1, 0, 0, 0, 764, 758, 1, 0, 0, 0, 764, 759, 1, 0, 0, 0, 764, 760, 1, 0, 0, 0, 764, 761, 1, 0, 0, 0, 764, 762, 1, 0, 0, 0, 764, 763, 1, 0, 0, 0, 765, 155, 1, 0, 0, 0, 766, 769, 3, 144, 72, 0, 767, 768, 5, 37, 0, 0, 768, 770, 3, 144, 72, 0, 769, 767, 1, 0, 0, 0, 769, 770, 1, 0, 0, 0, 770, 771, 1, 0, 0, 0, 771, 775, 5, 66, 0, 0, 772, 774, 3, 150, 75, 0, 773, 772, 1, 0, 0, 0, 774, 777, 1, 0, 0, 0, 775, 773, 1, 0, 0, 0, 775, 776, 1, 0, 0, 0, 776, 157, 1, 0, 0, 0, 777, 775, 1, 0, 0, 0, 778, 780, 5, 62, 0, 0, 779, 781, 5, 58, 0, 0, 780, 779, 1, 0, 0, 0, 780, 781, 1, 0, 0, 0, 781, 159, 1, 0, 0, 0, 782, 784, 5, 54, 0, 0, 783, 785, 5, 62, 0, 0, 784, 783, 1, 0, 0, 0, 785, 786, 1, 0, 0, 0, 786, 784, 1, 0, 0, 0, 786, 787, 1, 0, 0, 0, 787, 789, 1, 0, 0, 0, 788, 790, 5, 58, 0, 0, 789, 788, 1, 0, 0, 0, 789, 790, 1, 0, 0, 0, 790, 792, 1, 0, 0, 0, 791, 793, 7, 4, 0, 0, 792, 791, 1, 0, 0, 0, 792, 793, 1, 0, 0, 0, 793, 161, 1, 0, 0, 0, 794, 795, 5, 60, 0, 0, 795, 797, 7, 12, 0, 0, 796, 798, 5, 58, 0, 0, 797, 796, 1, 0, 0, 0, 797, 798, 1, 0, 0, 0, 798, 163, 1, 0, 0, 0, 799, 800, 3, 174, 87, 0, 800, 801, 5, 55, 0, 0, 801, 802, 3, 174, 87, 0, 802, 165, 1, 0, 0, 0, 803, 805, 5, 67, 0, 0, 804, 806, 5, 58, 0, 0, 805, 804, 1, 0, 0, 0, 805, 806, 1, 0, 0, 0, 806, 167, 1, 0, 0, 0, 807, 808, 5, 67, 0, 0, 808, 169, 1, 0, 0, 0, 809, 810, 5, 68, 0, 0, 810, 171, 1, 0, 0, 0, 811, 812, 5, 69, 0, 0, 812, 173, 1, 0, 0, 0, 813, 816, 5, 60, 0, 0, 814, 816, 3, 162, 81, 0, 815, 813, 1, 0, 0, 0, 815, 814, 1, 0, 0, 0, 816, 175, 1, 0, 0, 0, 817, 818, 7, 13, 0, 0, 818, 177, 1, 0, 0, 0, 819, 824, 3, 144, 72, 0, 820, 824, 3, 168, 84, 0, 821, 824, 3, 172, 86, 0, 822, 824, 3, 170, 85, 0, 823, 819, 1, 0, 0, 0, 823, 820, 1, 0, 0, 0, 823, 821, 1, 0, 0, 0, 823, 822, 1, 0, 0, 0, 824, 179, 1, 0, 0, 0, 825, 826, 7, 14, 0, 0, 826, 181, 1, 0, 0, 0, 87, 185, 202, 214, 219, 226, 228, 234, 241, 243, 249, 257, 263, 270, 282, 287, 294, 300, 307, 312, 319, 325, 332, 337, 344, 350, 356, 363, 370, 376, 382, 387, 394, 404, 414, 427, 435, 441, 449, 454, 493, 506, 517, 526, 532, 539, 546, 556, 567, 572, 580, 585, 595, 604, 609, 612, 616, 621, 627, 633, 641, 648, 656, 664, 669, 676, 680, 684, 690, 696, 701, 703, 714, 722, 728, 737, 744, 764, 769, 775, 780, 786, 789, 792, 797, 805, 815, 823]
\ No newline at end of file
diff --git a/src/import/generated/FSHParser.js b/src/import/generated/FSHParser.js
index f739b60..c41677f 100644
--- a/src/import/generated/FSHParser.js
+++ b/src/import/generated/FSHParser.js
@@ -4,7 +4,7 @@ import antlr4 from 'antlr4';
 import FSHListener from './FSHListener.js';
 import FSHVisitor from './FSHVisitor.js';
 
-const serializedATN = [4,1,89,838,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,
+const serializedATN = [4,1,89,828,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,
 4,2,5,7,5,2,6,7,6,2,7,7,7,2,8,7,8,2,9,7,9,2,10,7,10,2,11,7,11,2,12,7,12,
 2,13,7,13,2,14,7,14,2,15,7,15,2,16,7,16,2,17,7,17,2,18,7,18,2,19,7,19,2,
 20,7,20,2,21,7,21,2,22,7,22,2,23,7,23,2,24,7,24,2,25,7,25,2,26,7,26,2,27,
@@ -30,260 +30,256 @@ const serializedATN = [4,1,89,838,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,
 324,8,13,10,13,12,13,327,9,13,1,14,1,14,1,14,1,14,3,14,333,8,14,1,15,1,15,
 1,15,3,15,338,8,15,1,16,1,16,1,16,5,16,343,8,16,10,16,12,16,346,9,16,1,16,
 5,16,349,8,16,10,16,12,16,352,9,16,1,17,1,17,1,17,3,17,357,8,17,1,18,1,18,
-1,18,3,18,362,8,18,1,19,1,19,1,19,5,19,367,8,19,10,19,12,19,370,9,19,1,19,
-5,19,373,8,19,10,19,12,19,376,9,19,1,20,1,20,1,20,3,20,381,8,20,1,21,1,21,
-1,21,3,21,386,8,21,1,22,1,22,1,22,4,22,391,8,22,11,22,12,22,392,1,23,1,23,
-1,23,1,23,1,23,1,23,1,23,1,23,3,23,403,8,23,1,24,1,24,1,24,1,24,1,25,1,25,
-5,25,411,8,25,10,25,12,25,414,9,25,1,25,1,25,1,26,1,26,1,27,1,27,1,28,1,
-28,5,28,424,8,28,10,28,12,28,427,9,28,1,29,1,29,1,29,5,29,432,8,29,10,29,
-12,29,435,9,29,1,29,5,29,438,8,29,10,29,12,29,441,9,29,1,30,1,30,1,30,1,
-30,1,30,3,30,448,8,30,1,31,1,31,1,31,3,31,453,8,31,1,32,1,32,1,32,1,33,1,
-33,1,33,1,34,1,34,1,34,1,35,1,35,1,35,1,36,1,36,1,36,1,37,1,37,1,37,1,38,
-1,38,1,38,1,39,1,39,1,39,1,40,1,40,1,40,1,41,1,41,1,41,1,42,1,42,1,42,1,
-43,1,43,5,43,490,8,43,10,43,12,43,493,9,43,1,43,1,43,1,44,1,44,1,45,1,45,
-1,46,1,46,5,46,503,8,46,10,46,12,46,506,9,46,1,46,1,46,1,47,1,47,1,47,1,
-47,5,47,514,8,47,10,47,12,47,517,9,47,1,48,1,48,1,48,1,48,5,48,523,8,48,
-10,48,12,48,526,9,48,1,48,4,48,529,8,48,11,48,12,48,530,1,49,1,49,1,49,1,
-49,1,49,3,49,538,8,49,1,50,1,50,1,50,1,50,1,50,3,50,545,8,50,1,51,1,51,1,
-51,1,51,1,51,1,51,5,51,553,8,51,10,51,12,51,556,9,51,1,52,1,52,1,52,1,52,
-1,52,1,52,5,52,564,8,52,10,52,12,52,567,9,52,1,53,1,53,3,53,571,8,53,1,53,
-1,53,1,53,1,53,5,53,577,8,53,10,53,12,53,580,9,53,1,54,1,54,3,54,584,8,54,
-1,54,1,54,1,54,1,54,1,55,1,55,5,55,592,8,55,10,55,12,55,595,9,55,1,55,1,
-55,1,55,1,55,1,56,1,56,3,56,603,8,56,1,56,1,56,1,56,3,56,608,8,56,1,56,3,
-56,611,8,56,1,57,1,57,3,57,615,8,57,1,57,1,57,1,57,3,57,620,8,57,1,58,1,
-58,5,58,624,8,58,10,58,12,58,627,9,58,1,58,1,58,1,58,3,58,632,8,58,1,59,
-1,59,1,59,1,59,5,59,638,8,59,10,59,12,59,641,9,59,1,59,1,59,1,59,1,59,3,
-59,647,8,59,1,60,1,60,1,60,1,60,5,60,653,8,60,10,60,12,60,656,9,60,1,60,
-1,60,1,60,5,60,661,8,60,10,60,12,60,664,9,60,1,60,1,60,3,60,668,8,60,1,61,
-1,61,1,61,1,62,1,62,3,62,675,8,62,1,62,1,62,3,62,679,8,62,1,63,1,63,3,63,
-683,8,63,1,63,1,63,1,63,4,63,688,8,63,11,63,12,63,689,1,63,1,63,1,63,3,63,
-695,8,63,1,64,1,64,1,64,1,64,3,64,701,8,64,1,65,1,65,1,65,1,65,3,65,707,
-8,65,1,65,1,65,1,65,3,65,712,8,65,3,65,714,8,65,1,66,1,66,1,66,1,67,1,67,
-1,67,1,67,5,67,723,8,67,10,67,12,67,726,9,67,1,68,1,68,1,68,5,68,731,8,68,
-10,68,12,68,734,9,68,1,69,1,69,1,69,3,69,739,8,69,1,70,1,70,1,71,1,71,1,
-71,1,71,1,71,3,71,748,8,71,1,72,1,72,1,73,1,73,1,73,3,73,755,8,73,1,74,1,
-74,1,75,1,75,1,76,1,76,1,77,1,77,1,77,1,77,1,77,1,77,1,77,1,77,1,77,1,77,
-1,77,1,77,3,77,775,8,77,1,78,1,78,1,78,3,78,780,8,78,1,78,1,78,5,78,784,
-8,78,10,78,12,78,787,9,78,1,79,1,79,3,79,791,8,79,1,80,1,80,4,80,795,8,80,
-11,80,12,80,796,1,80,3,80,800,8,80,1,80,3,80,803,8,80,1,81,1,81,1,81,3,81,
-808,8,81,1,82,1,82,1,82,1,82,1,83,1,83,3,83,816,8,83,1,84,1,84,1,85,1,85,
-1,86,1,86,1,87,1,87,3,87,826,8,87,1,88,1,88,1,89,1,89,1,89,1,89,3,89,834,
-8,89,1,90,1,90,1,90,0,0,91,0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,
-34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,
-82,84,86,88,90,92,94,96,98,100,102,104,106,108,110,112,114,116,118,120,122,
-124,126,128,130,132,134,136,138,140,142,144,146,148,150,152,154,156,158,
-160,162,164,166,168,170,172,174,176,178,180,0,15,2,0,62,62,73,73,2,0,78,
-78,80,80,2,0,79,79,81,81,2,0,1,4,6,10,1,0,58,59,2,0,82,82,84,84,2,0,83,83,
-85,85,1,0,44,45,2,0,53,53,73,73,5,0,26,30,46,46,48,49,60,60,73,73,1,0,25,
-30,1,0,32,35,1,0,61,62,1,0,42,43,3,0,26,31,36,49,52,52,892,0,185,1,0,0,0,
-2,202,1,0,0,0,4,204,1,0,0,0,6,209,1,0,0,0,8,222,1,0,0,0,10,237,1,0,0,0,12,
-252,1,0,0,0,14,270,1,0,0,0,16,282,1,0,0,0,18,287,1,0,0,0,20,289,1,0,0,0,
-22,307,1,0,0,0,24,312,1,0,0,0,26,314,1,0,0,0,28,332,1,0,0,0,30,337,1,0,0,
-0,32,339,1,0,0,0,34,356,1,0,0,0,36,361,1,0,0,0,38,363,1,0,0,0,40,380,1,0,
-0,0,42,385,1,0,0,0,44,387,1,0,0,0,46,402,1,0,0,0,48,404,1,0,0,0,50,408,1,
-0,0,0,52,417,1,0,0,0,54,419,1,0,0,0,56,421,1,0,0,0,58,428,1,0,0,0,60,447,
-1,0,0,0,62,452,1,0,0,0,64,454,1,0,0,0,66,457,1,0,0,0,68,460,1,0,0,0,70,463,
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+0,776,157,1,0,0,0,777,775,1,0,0,0,778,780,5,62,0,0,779,781,5,58,0,0,780,
+779,1,0,0,0,780,781,1,0,0,0,781,159,1,0,0,0,782,784,5,54,0,0,783,785,5,62,
+0,0,784,783,1,0,0,0,785,786,1,0,0,0,786,784,1,0,0,0,786,787,1,0,0,0,787,
+789,1,0,0,0,788,790,5,58,0,0,789,788,1,0,0,0,789,790,1,0,0,0,790,792,1,0,
+0,0,791,793,7,4,0,0,792,791,1,0,0,0,792,793,1,0,0,0,793,161,1,0,0,0,794,
+795,5,60,0,0,795,797,7,12,0,0,796,798,5,58,0,0,797,796,1,0,0,0,797,798,1,
+0,0,0,798,163,1,0,0,0,799,800,3,174,87,0,800,801,5,55,0,0,801,802,3,174,
+87,0,802,165,1,0,0,0,803,805,5,67,0,0,804,806,5,58,0,0,805,804,1,0,0,0,805,
+806,1,0,0,0,806,167,1,0,0,0,807,808,5,67,0,0,808,169,1,0,0,0,809,810,5,68,
+0,0,810,171,1,0,0,0,811,812,5,69,0,0,812,173,1,0,0,0,813,816,5,60,0,0,814,
+816,3,162,81,0,815,813,1,0,0,0,815,814,1,0,0,0,816,175,1,0,0,0,817,818,7,
+13,0,0,818,177,1,0,0,0,819,824,3,144,72,0,820,824,3,168,84,0,821,824,3,172,
+86,0,822,824,3,170,85,0,823,819,1,0,0,0,823,820,1,0,0,0,823,821,1,0,0,0,
+823,822,1,0,0,0,824,179,1,0,0,0,825,826,7,14,0,0,826,181,1,0,0,0,87,185,
+202,214,219,226,228,234,241,243,249,257,263,270,282,287,294,300,307,312,
+319,325,332,337,344,350,356,363,370,376,382,387,394,404,414,427,435,441,
+449,454,493,506,517,526,532,539,546,556,567,572,580,585,595,604,609,612,
+616,621,627,633,641,648,656,664,669,676,680,684,690,696,701,703,714,722,
+728,737,744,764,769,775,780,786,789,792,797,805,815,823];
 
 
 const atn = new antlr4.atn.ATNDeserializer().deserialize(serializedATN);
@@ -1283,7 +1279,7 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new VsRuleContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 36, FSHParser.RULE_vsRule);
 	    try {
-	        this.state = 361;
+	        this.state = 363;
 	        this._errHandler.sync(this);
 	        var la_ = this._interp.adaptivePredict(this._input,26,this._ctx);
 	        switch(la_) {
@@ -1302,9 +1298,21 @@ export default class FSHParser extends antlr4.Parser {
 	        case 3:
 	            this.enterOuterAlt(localctx, 3);
 	            this.state = 360;
+	            this.codeCaretValueRule();
+	            break;
+
+	        case 4:
+	            this.enterOuterAlt(localctx, 4);
+	            this.state = 361;
 	            this.insertRule();
 	            break;
 
+	        case 5:
+	            this.enterOuterAlt(localctx, 5);
+	            this.state = 362;
+	            this.codeInsertRule();
+	            break;
+
 	        }
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -1328,27 +1336,27 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 363;
+	        this.state = 365;
 	        this.match(FSHParser.KW_CODESYSTEM);
-	        this.state = 364;
+	        this.state = 366;
 	        this.name();
-	        this.state = 368;
+	        this.state = 370;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while((((_la) & ~0x1f) === 0 && ((1 << _la) & 114688) !== 0)) {
-	            this.state = 365;
+	            this.state = 367;
 	            this.csMetadata();
-	            this.state = 370;
+	            this.state = 372;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 374;
+	        this.state = 376;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===54) {
-	            this.state = 371;
+	            this.state = 373;
 	            this.csRule();
-	            this.state = 376;
+	            this.state = 378;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -1372,22 +1380,22 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new CsMetadataContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 40, FSHParser.RULE_csMetadata);
 	    try {
-	        this.state = 380;
+	        this.state = 382;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 14:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 377;
+	            this.state = 379;
 	            this.id();
 	            break;
 	        case 15:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 378;
+	            this.state = 380;
 	            this.title();
 	            break;
 	        case 16:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 379;
+	            this.state = 381;
 	            this.description();
 	            break;
 	        default:
@@ -1413,25 +1421,25 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new CsRuleContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 42, FSHParser.RULE_csRule);
 	    try {
-	        this.state = 385;
+	        this.state = 387;
 	        this._errHandler.sync(this);
 	        var la_ = this._interp.adaptivePredict(this._input,30,this._ctx);
 	        switch(la_) {
 	        case 1:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 382;
+	            this.state = 384;
 	            this.concept();
 	            break;
 
 	        case 2:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 383;
+	            this.state = 385;
 	            this.codeCaretValueRule();
 	            break;
 
 	        case 3:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 384;
+	            this.state = 386;
 	            this.codeInsertRule();
 	            break;
 
@@ -1458,17 +1466,17 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 387;
+	        this.state = 389;
 	        this.match(FSHParser.KW_RULESET);
-	        this.state = 388;
+	        this.state = 390;
 	        this.match(FSHParser.RULESET_REFERENCE);
-	        this.state = 390; 
+	        this.state = 392; 
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        do {
-	            this.state = 389;
+	            this.state = 391;
 	            this.ruleSetRule();
-	            this.state = 392; 
+	            this.state = 394; 
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        } while(_la===54);
@@ -1492,55 +1500,55 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new RuleSetRuleContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 46, FSHParser.RULE_ruleSetRule);
 	    try {
-	        this.state = 402;
+	        this.state = 404;
 	        this._errHandler.sync(this);
 	        var la_ = this._interp.adaptivePredict(this._input,32,this._ctx);
 	        switch(la_) {
 	        case 1:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 394;
+	            this.state = 396;
 	            this.sdRule();
 	            break;
 
 	        case 2:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 395;
+	            this.state = 397;
 	            this.addElementRule();
 	            break;
 
 	        case 3:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 396;
+	            this.state = 398;
 	            this.addCRElementRule();
 	            break;
 
 	        case 4:
 	            this.enterOuterAlt(localctx, 4);
-	            this.state = 397;
+	            this.state = 399;
 	            this.concept();
 	            break;
 
 	        case 5:
 	            this.enterOuterAlt(localctx, 5);
-	            this.state = 398;
+	            this.state = 400;
 	            this.codeCaretValueRule();
 	            break;
 
 	        case 6:
 	            this.enterOuterAlt(localctx, 6);
-	            this.state = 399;
+	            this.state = 401;
 	            this.codeInsertRule();
 	            break;
 
 	        case 7:
 	            this.enterOuterAlt(localctx, 7);
-	            this.state = 400;
+	            this.state = 402;
 	            this.vsComponent();
 	            break;
 
 	        case 8:
 	            this.enterOuterAlt(localctx, 8);
-	            this.state = 401;
+	            this.state = 403;
 	            this.mappingRule();
 	            break;
 
@@ -1566,11 +1574,11 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 48, FSHParser.RULE_paramRuleSet);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 404;
+	        this.state = 406;
 	        this.match(FSHParser.KW_RULESET);
-	        this.state = 405;
+	        this.state = 407;
 	        this.paramRuleSetRef();
-	        this.state = 406;
+	        this.state = 408;
 	        this.paramRuleSetContent();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -1594,19 +1602,19 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 408;
+	        this.state = 410;
 	        this.match(FSHParser.PARAM_RULESET_REFERENCE);
-	        this.state = 412;
+	        this.state = 414;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===78 || _la===80) {
-	            this.state = 409;
+	            this.state = 411;
 	            this.parameter();
-	            this.state = 414;
+	            this.state = 416;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 415;
+	        this.state = 417;
 	        this.lastParameter();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -1630,7 +1638,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 417;
+	        this.state = 419;
 	        _la = this._input.LA(1);
 	        if(!(_la===78 || _la===80)) {
 	        this._errHandler.recoverInline(this);
@@ -1661,7 +1669,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 419;
+	        this.state = 421;
 	        _la = this._input.LA(1);
 	        if(!(_la===79 || _la===81)) {
 	        this._errHandler.recoverInline(this);
@@ -1692,14 +1700,14 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 421;
+	        this.state = 423;
 	        this.match(FSHParser.STAR);
-	        this.state = 425;
+	        this.state = 427;
 	        this._errHandler.sync(this);
 	        var _alt = this._interp.adaptivePredict(this._input,34,this._ctx)
 	        while(_alt!=2 && _alt!=antlr4.atn.ATN.INVALID_ALT_NUMBER) {
 	            if(_alt===1) {
-	                this.state = 422;
+	                this.state = 424;
 	                _la = this._input.LA(1);
 	                if(_la<=0 || (((_la) & ~0x1f) === 0 && ((1 << _la) & 2014) !== 0)) {
 	                this._errHandler.recoverInline(this);
@@ -1709,7 +1717,7 @@ export default class FSHParser extends antlr4.Parser {
 	                    this.consume();
 	                } 
 	            }
-	            this.state = 427;
+	            this.state = 429;
 	            this._errHandler.sync(this);
 	            _alt = this._interp.adaptivePredict(this._input,34,this._ctx);
 	        }
@@ -1736,27 +1744,27 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 428;
+	        this.state = 430;
 	        this.match(FSHParser.KW_MAPPING);
-	        this.state = 429;
+	        this.state = 431;
 	        this.name();
-	        this.state = 433;
+	        this.state = 435;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while((((_la) & ~0x1f) === 0 && ((1 << _la) & 6406144) !== 0)) {
-	            this.state = 430;
+	            this.state = 432;
 	            this.mappingMetadata();
-	            this.state = 435;
+	            this.state = 437;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 439;
+	        this.state = 441;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===54) {
-	            this.state = 436;
+	            this.state = 438;
 	            this.mappingEntityRule();
-	            this.state = 441;
+	            this.state = 443;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -1780,32 +1788,32 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new MappingMetadataContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 60, FSHParser.RULE_mappingMetadata);
 	    try {
-	        this.state = 447;
+	        this.state = 449;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 14:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 442;
+	            this.state = 444;
 	            this.id();
 	            break;
 	        case 21:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 443;
+	            this.state = 445;
 	            this.source();
 	            break;
 	        case 22:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 444;
+	            this.state = 446;
 	            this.target();
 	            break;
 	        case 16:
 	            this.enterOuterAlt(localctx, 4);
-	            this.state = 445;
+	            this.state = 447;
 	            this.description();
 	            break;
 	        case 15:
 	            this.enterOuterAlt(localctx, 5);
-	            this.state = 446;
+	            this.state = 448;
 	            this.title();
 	            break;
 	        default:
@@ -1831,25 +1839,25 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new MappingEntityRuleContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 62, FSHParser.RULE_mappingEntityRule);
 	    try {
-	        this.state = 452;
+	        this.state = 454;
 	        this._errHandler.sync(this);
 	        var la_ = this._interp.adaptivePredict(this._input,38,this._ctx);
 	        switch(la_) {
 	        case 1:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 449;
+	            this.state = 451;
 	            this.mappingRule();
 	            break;
 
 	        case 2:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 450;
+	            this.state = 452;
 	            this.insertRule();
 	            break;
 
 	        case 3:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 451;
+	            this.state = 453;
 	            this.pathRule();
 	            break;
 
@@ -1875,9 +1883,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 64, FSHParser.RULE_parent);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 454;
+	        this.state = 456;
 	        this.match(FSHParser.KW_PARENT);
-	        this.state = 455;
+	        this.state = 457;
 	        this.name();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -1900,9 +1908,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 66, FSHParser.RULE_id);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 457;
+	        this.state = 459;
 	        this.match(FSHParser.KW_ID);
-	        this.state = 458;
+	        this.state = 460;
 	        this.name();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -1925,9 +1933,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 68, FSHParser.RULE_title);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 460;
+	        this.state = 462;
 	        this.match(FSHParser.KW_TITLE);
-	        this.state = 461;
+	        this.state = 463;
 	        this.match(FSHParser.STRING);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -1951,9 +1959,9 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 463;
+	        this.state = 465;
 	        this.match(FSHParser.KW_DESCRIPTION);
-	        this.state = 464;
+	        this.state = 466;
 	        _la = this._input.LA(1);
 	        if(!(_la===58 || _la===59)) {
 	        this._errHandler.recoverInline(this);
@@ -1983,9 +1991,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 72, FSHParser.RULE_expression);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 466;
+	        this.state = 468;
 	        this.match(FSHParser.KW_EXPRESSION);
-	        this.state = 467;
+	        this.state = 469;
 	        this.match(FSHParser.STRING);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2008,9 +2016,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 74, FSHParser.RULE_xpath);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 469;
+	        this.state = 471;
 	        this.match(FSHParser.KW_XPATH);
-	        this.state = 470;
+	        this.state = 472;
 	        this.match(FSHParser.STRING);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2033,9 +2041,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 76, FSHParser.RULE_severity);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 472;
+	        this.state = 474;
 	        this.match(FSHParser.KW_SEVERITY);
-	        this.state = 473;
+	        this.state = 475;
 	        this.match(FSHParser.CODE);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2058,9 +2066,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 78, FSHParser.RULE_instanceOf);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 475;
+	        this.state = 477;
 	        this.match(FSHParser.KW_INSTANCEOF);
-	        this.state = 476;
+	        this.state = 478;
 	        this.name();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2083,9 +2091,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 80, FSHParser.RULE_usage);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 478;
+	        this.state = 480;
 	        this.match(FSHParser.KW_USAGE);
-	        this.state = 479;
+	        this.state = 481;
 	        this.match(FSHParser.CODE);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2108,9 +2116,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 82, FSHParser.RULE_source);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 481;
+	        this.state = 483;
 	        this.match(FSHParser.KW_SOURCE);
-	        this.state = 482;
+	        this.state = 484;
 	        this.name();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2133,9 +2141,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 84, FSHParser.RULE_target);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 484;
+	        this.state = 486;
 	        this.match(FSHParser.KW_TARGET);
-	        this.state = 485;
+	        this.state = 487;
 	        this.match(FSHParser.STRING);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2159,19 +2167,19 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 487;
+	        this.state = 489;
 	        this.match(FSHParser.KW_CONTEXT);
-	        this.state = 491;
+	        this.state = 493;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===82 || _la===84) {
-	            this.state = 488;
+	            this.state = 490;
 	            this.contextItem();
-	            this.state = 493;
+	            this.state = 495;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 494;
+	        this.state = 496;
 	        this.lastContextItem();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2195,7 +2203,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 496;
+	        this.state = 498;
 	        _la = this._input.LA(1);
 	        if(!(_la===82 || _la===84)) {
 	        this._errHandler.recoverInline(this);
@@ -2226,7 +2234,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 498;
+	        this.state = 500;
 	        _la = this._input.LA(1);
 	        if(!(_la===83 || _la===85)) {
 	        this._errHandler.recoverInline(this);
@@ -2257,19 +2265,19 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 500;
+	        this.state = 502;
 	        this.match(FSHParser.KW_CHARACTERISTICS);
-	        this.state = 504;
+	        this.state = 506;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===87) {
-	            this.state = 501;
+	            this.state = 503;
 	            this.match(FSHParser.CODE_ITEM);
-	            this.state = 506;
+	            this.state = 508;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 507;
+	        this.state = 509;
 	        this.match(FSHParser.LAST_CODE_ITEM);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2293,19 +2301,19 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 509;
+	        this.state = 511;
 	        this.match(FSHParser.STAR);
-	        this.state = 510;
+	        this.state = 512;
 	        this.path();
-	        this.state = 511;
+	        this.state = 513;
 	        this.match(FSHParser.CARD);
-	        this.state = 515;
+	        this.state = 517;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while((((_la) & ~0x1f) === 0 && ((1 << _la) & 2113929216) !== 0)) {
-	            this.state = 512;
+	            this.state = 514;
 	            this.flag();
-	            this.state = 517;
+	            this.state = 519;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -2331,29 +2339,29 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 518;
+	        this.state = 520;
 	        this.match(FSHParser.STAR);
-	        this.state = 519;
+	        this.state = 521;
 	        this.path();
-	        this.state = 524;
+	        this.state = 526;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===38) {
-	            this.state = 520;
+	            this.state = 522;
 	            this.match(FSHParser.KW_AND);
-	            this.state = 521;
+	            this.state = 523;
 	            this.path();
-	            this.state = 526;
+	            this.state = 528;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 528; 
+	        this.state = 530; 
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        do {
-	            this.state = 527;
+	            this.state = 529;
 	            this.flag();
-	            this.state = 530; 
+	            this.state = 532; 
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        } while((((_la) & ~0x1f) === 0 && ((1 << _la) & 2113929216) !== 0));
@@ -2379,19 +2387,19 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 532;
+	        this.state = 534;
 	        this.match(FSHParser.STAR);
-	        this.state = 533;
+	        this.state = 535;
 	        this.path();
-	        this.state = 534;
+	        this.state = 536;
 	        this.match(FSHParser.KW_FROM);
-	        this.state = 535;
-	        this.name();
 	        this.state = 537;
+	        this.name();
+	        this.state = 539;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(((((_la - 32)) & ~0x1f) === 0 && ((1 << (_la - 32)) & 15) !== 0)) {
-	            this.state = 536;
+	            this.state = 538;
 	            this.strength();
 	        }
 
@@ -2417,19 +2425,19 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 539;
+	        this.state = 541;
 	        this.match(FSHParser.STAR);
-	        this.state = 540;
+	        this.state = 542;
 	        this.path();
-	        this.state = 541;
+	        this.state = 543;
 	        this.match(FSHParser.EQUAL);
-	        this.state = 542;
-	        this.value();
 	        this.state = 544;
+	        this.value();
+	        this.state = 546;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===50) {
-	            this.state = 543;
+	            this.state = 545;
 	            this.match(FSHParser.KW_EXACTLY);
 	        }
 
@@ -2455,23 +2463,23 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 546;
+	        this.state = 548;
 	        this.match(FSHParser.STAR);
-	        this.state = 547;
+	        this.state = 549;
 	        this.path();
-	        this.state = 548;
+	        this.state = 550;
 	        this.match(FSHParser.KW_CONTAINS);
-	        this.state = 549;
+	        this.state = 551;
 	        this.item();
-	        this.state = 554;
+	        this.state = 556;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===38) {
-	            this.state = 550;
+	            this.state = 552;
 	            this.match(FSHParser.KW_AND);
-	            this.state = 551;
+	            this.state = 553;
 	            this.item();
-	            this.state = 556;
+	            this.state = 558;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -2497,23 +2505,23 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 557;
+	        this.state = 559;
 	        this.match(FSHParser.STAR);
-	        this.state = 558;
+	        this.state = 560;
 	        this.path();
-	        this.state = 559;
+	        this.state = 561;
 	        this.match(FSHParser.KW_ONLY);
-	        this.state = 560;
+	        this.state = 562;
 	        this.targetType();
-	        this.state = 565;
+	        this.state = 567;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===40) {
-	            this.state = 561;
+	            this.state = 563;
 	            this.match(FSHParser.KW_OR);
-	            this.state = 562;
+	            this.state = 564;
 	            this.targetType();
-	            this.state = 567;
+	            this.state = 569;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -2539,29 +2547,29 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 568;
-	        this.match(FSHParser.STAR);
 	        this.state = 570;
+	        this.match(FSHParser.STAR);
+	        this.state = 572;
 	        this._errHandler.sync(this);
 	        var la_ = this._interp.adaptivePredict(this._input,48,this._ctx);
 	        if(la_===1) {
-	            this.state = 569;
+	            this.state = 571;
 	            this.path();
 
 	        }
-	        this.state = 572;
+	        this.state = 574;
 	        this.match(FSHParser.KW_OBEYS);
-	        this.state = 573;
+	        this.state = 575;
 	        this.name();
-	        this.state = 578;
+	        this.state = 580;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===38) {
-	            this.state = 574;
+	            this.state = 576;
 	            this.match(FSHParser.KW_AND);
-	            this.state = 575;
+	            this.state = 577;
 	            this.name();
-	            this.state = 580;
+	            this.state = 582;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -2587,21 +2595,21 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 581;
-	        this.match(FSHParser.STAR);
 	        this.state = 583;
+	        this.match(FSHParser.STAR);
+	        this.state = 585;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(((((_la - 26)) & ~0x1f) === 0 && ((1 << (_la - 26)) & 83885119) !== 0) || _la===60 || _la===73) {
-	            this.state = 582;
+	            this.state = 584;
 	            this.path();
 	        }
 
-	        this.state = 585;
+	        this.state = 587;
 	        this.caretPath();
-	        this.state = 586;
+	        this.state = 588;
 	        this.match(FSHParser.EQUAL);
-	        this.state = 587;
+	        this.state = 589;
 	        this.value();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2625,23 +2633,23 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 589;
+	        this.state = 591;
 	        this.match(FSHParser.STAR);
-	        this.state = 593;
+	        this.state = 595;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===62) {
-	            this.state = 590;
+	            this.state = 592;
 	            this.match(FSHParser.CODE);
-	            this.state = 595;
+	            this.state = 597;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 596;
+	        this.state = 598;
 	        this.caretPath();
-	        this.state = 597;
+	        this.state = 599;
 	        this.match(FSHParser.EQUAL);
-	        this.state = 598;
+	        this.state = 600;
 	        this.value();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2665,33 +2673,33 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 600;
-	        this.match(FSHParser.STAR);
 	        this.state = 602;
+	        this.match(FSHParser.STAR);
+	        this.state = 604;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(((((_la - 26)) & ~0x1f) === 0 && ((1 << (_la - 26)) & 83885119) !== 0) || _la===60 || _la===73) {
-	            this.state = 601;
+	            this.state = 603;
 	            this.path();
 	        }
 
-	        this.state = 604;
+	        this.state = 606;
 	        this.match(FSHParser.ARROW);
-	        this.state = 605;
-	        this.match(FSHParser.STRING);
 	        this.state = 607;
+	        this.match(FSHParser.STRING);
+	        this.state = 609;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58) {
-	            this.state = 606;
+	            this.state = 608;
 	            this.match(FSHParser.STRING);
 	        }
 
-	        this.state = 610;
+	        this.state = 612;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===62) {
-	            this.state = 609;
+	            this.state = 611;
 	            this.match(FSHParser.CODE);
 	        }
 
@@ -2717,27 +2725,27 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 612;
-	        this.match(FSHParser.STAR);
 	        this.state = 614;
+	        this.match(FSHParser.STAR);
+	        this.state = 616;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(((((_la - 26)) & ~0x1f) === 0 && ((1 << (_la - 26)) & 83885119) !== 0) || _la===60 || _la===73) {
-	            this.state = 613;
+	            this.state = 615;
 	            this.path();
 	        }
 
-	        this.state = 616;
+	        this.state = 618;
 	        this.match(FSHParser.KW_INSERT);
-	        this.state = 619;
+	        this.state = 621;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 77:
-	            this.state = 617;
+	            this.state = 619;
 	            this.match(FSHParser.RULESET_REFERENCE);
 	            break;
 	        case 76:
-	            this.state = 618;
+	            this.state = 620;
 	            this.paramRuleSetRef();
 	            break;
 	        default:
@@ -2765,29 +2773,29 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 621;
+	        this.state = 623;
 	        this.match(FSHParser.STAR);
-	        this.state = 625;
+	        this.state = 627;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===62) {
-	            this.state = 622;
+	            this.state = 624;
 	            this.match(FSHParser.CODE);
-	            this.state = 627;
+	            this.state = 629;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 628;
+	        this.state = 630;
 	        this.match(FSHParser.KW_INSERT);
-	        this.state = 631;
+	        this.state = 633;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 77:
-	            this.state = 629;
+	            this.state = 631;
 	            this.match(FSHParser.RULESET_REFERENCE);
 	            break;
 	        case 76:
-	            this.state = 630;
+	            this.state = 632;
 	            this.paramRuleSetRef();
 	            break;
 	        default:
@@ -2815,25 +2823,25 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 633;
+	        this.state = 635;
 	        this.match(FSHParser.STAR);
-	        this.state = 634;
+	        this.state = 636;
 	        this.path();
-	        this.state = 635;
+	        this.state = 637;
 	        this.match(FSHParser.CARD);
-	        this.state = 639;
+	        this.state = 641;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while((((_la) & ~0x1f) === 0 && ((1 << _la) & 2113929216) !== 0)) {
-	            this.state = 636;
+	            this.state = 638;
 	            this.flag();
-	            this.state = 641;
+	            this.state = 643;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 642;
+	        this.state = 644;
 	        this.match(FSHParser.KW_CONTENTREFERENCE);
-	        this.state = 643;
+	        this.state = 645;
 	        _la = this._input.LA(1);
 	        if(!(_la===62 || _la===73)) {
 	        this._errHandler.recoverInline(this);
@@ -2842,13 +2850,13 @@ export default class FSHParser extends antlr4.Parser {
 	        	this._errHandler.reportMatch(this);
 	            this.consume();
 	        }
-	        this.state = 644;
-	        this.match(FSHParser.STRING);
 	        this.state = 646;
+	        this.match(FSHParser.STRING);
+	        this.state = 648;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58 || _la===59) {
-	            this.state = 645;
+	            this.state = 647;
 	            _la = this._input.LA(1);
 	            if(!(_la===58 || _la===59)) {
 	            this._errHandler.recoverInline(this);
@@ -2881,46 +2889,46 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 648;
+	        this.state = 650;
 	        this.match(FSHParser.STAR);
-	        this.state = 649;
+	        this.state = 651;
 	        this.path();
-	        this.state = 650;
+	        this.state = 652;
 	        this.match(FSHParser.CARD);
-	        this.state = 654;
+	        this.state = 656;
 	        this._errHandler.sync(this);
 	        var _alt = this._interp.adaptivePredict(this._input,61,this._ctx)
 	        while(_alt!=2 && _alt!=antlr4.atn.ATN.INVALID_ALT_NUMBER) {
 	            if(_alt===1) {
-	                this.state = 651;
+	                this.state = 653;
 	                this.flag(); 
 	            }
-	            this.state = 656;
+	            this.state = 658;
 	            this._errHandler.sync(this);
 	            _alt = this._interp.adaptivePredict(this._input,61,this._ctx);
 	        }
 
-	        this.state = 657;
+	        this.state = 659;
 	        this.targetType();
-	        this.state = 662;
+	        this.state = 664;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===40) {
-	            this.state = 658;
+	            this.state = 660;
 	            this.match(FSHParser.KW_OR);
-	            this.state = 659;
+	            this.state = 661;
 	            this.targetType();
-	            this.state = 664;
+	            this.state = 666;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
-	        this.state = 665;
-	        this.match(FSHParser.STRING);
 	        this.state = 667;
+	        this.match(FSHParser.STRING);
+	        this.state = 669;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58 || _la===59) {
-	            this.state = 666;
+	            this.state = 668;
 	            _la = this._input.LA(1);
 	            if(!(_la===58 || _la===59)) {
 	            this._errHandler.recoverInline(this);
@@ -2952,9 +2960,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 122, FSHParser.RULE_pathRule);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 669;
+	        this.state = 671;
 	        this.match(FSHParser.STAR);
-	        this.state = 670;
+	        this.state = 672;
 	        this.path();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -2978,13 +2986,13 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 672;
-	        this.match(FSHParser.STAR);
 	        this.state = 674;
+	        this.match(FSHParser.STAR);
+	        this.state = 676;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===44 || _la===45) {
-	            this.state = 673;
+	            this.state = 675;
 	            _la = this._input.LA(1);
 	            if(!(_la===44 || _la===45)) {
 	            this._errHandler.recoverInline(this);
@@ -2995,15 +3003,15 @@ export default class FSHParser extends antlr4.Parser {
 	            }
 	        }
 
-	        this.state = 678;
+	        this.state = 680;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 62:
-	            this.state = 676;
+	            this.state = 678;
 	            this.vsConceptComponent();
 	            break;
 	        case 46:
-	            this.state = 677;
+	            this.state = 679;
 	            this.vsFilterComponent();
 	            break;
 	        default:
@@ -3030,51 +3038,17 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 126, FSHParser.RULE_vsConceptComponent);
 	    var _la = 0;
 	    try {
-	        this.state = 694;
+	        this.enterOuterAlt(localctx, 1);
+	        this.state = 682;
+	        this.code();
+	        this.state = 684;
 	        this._errHandler.sync(this);
-	        var la_ = this._interp.adaptivePredict(this._input,68,this._ctx);
-	        switch(la_) {
-	        case 1:
-	            this.enterOuterAlt(localctx, 1);
-	            this.state = 680;
-	            this.code();
-	            this.state = 682;
-	            this._errHandler.sync(this);
-	            _la = this._input.LA(1);
-	            if(_la===31) {
-	                this.state = 681;
-	                this.vsComponentFrom();
-	            }
-
-	            break;
-
-	        case 2:
-	            this.enterOuterAlt(localctx, 2);
-	            this.state = 687; 
-	            this._errHandler.sync(this);
-	            var _alt = 1;
-	            do {
-	            	switch (_alt) {
-	            	case 1:
-	            		this.state = 684;
-	            		this.code();
-	            		this.state = 685;
-	            		this.match(FSHParser.KW_AND);
-	            		break;
-	            	default:
-	            		throw new antlr4.error.NoViableAltException(this);
-	            	}
-	            	this.state = 689; 
-	            	this._errHandler.sync(this);
-	            	_alt = this._interp.adaptivePredict(this._input,67, this._ctx);
-	            } while ( _alt!=2 && _alt!=antlr4.atn.ATN.INVALID_ALT_NUMBER );
-	            this.state = 691;
-	            this.code();
-	            this.state = 692;
+	        _la = this._input.LA(1);
+	        if(_la===31) {
+	            this.state = 683;
 	            this.vsComponentFrom();
-	            break;
-
 	        }
+
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
 		        localctx.exception = re;
@@ -3097,17 +3071,17 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 696;
+	        this.state = 686;
 	        this.match(FSHParser.KW_CODES);
-	        this.state = 697;
+	        this.state = 687;
 	        this.vsComponentFrom();
-	        this.state = 700;
+	        this.state = 690;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===47) {
-	            this.state = 698;
+	            this.state = 688;
 	            this.match(FSHParser.KW_WHERE);
-	            this.state = 699;
+	            this.state = 689;
 	            this.vsFilterList();
 	        }
 
@@ -3133,35 +3107,35 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 702;
+	        this.state = 692;
 	        this.match(FSHParser.KW_FROM);
-	        this.state = 713;
+	        this.state = 703;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 49:
-	            this.state = 703;
+	            this.state = 693;
 	            this.vsFromSystem();
-	            this.state = 706;
+	            this.state = 696;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	            if(_la===38) {
-	                this.state = 704;
+	                this.state = 694;
 	                this.match(FSHParser.KW_AND);
-	                this.state = 705;
+	                this.state = 695;
 	                this.vsFromValueset();
 	            }
 
 	            break;
 	        case 48:
-	            this.state = 708;
+	            this.state = 698;
 	            this.vsFromValueset();
-	            this.state = 711;
+	            this.state = 701;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	            if(_la===38) {
-	                this.state = 709;
+	                this.state = 699;
 	                this.match(FSHParser.KW_AND);
-	                this.state = 710;
+	                this.state = 700;
 	                this.vsFromSystem();
 	            }
 
@@ -3190,9 +3164,9 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 132, FSHParser.RULE_vsFromSystem);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 715;
+	        this.state = 705;
 	        this.match(FSHParser.KW_SYSTEM);
-	        this.state = 716;
+	        this.state = 706;
 	        this.name();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -3215,23 +3189,23 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 134, FSHParser.RULE_vsFromValueset);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 718;
+	        this.state = 708;
 	        this.match(FSHParser.KW_VSREFERENCE);
-	        this.state = 719;
+	        this.state = 709;
 	        this.name();
-	        this.state = 724;
+	        this.state = 714;
 	        this._errHandler.sync(this);
-	        var _alt = this._interp.adaptivePredict(this._input,73,this._ctx)
+	        var _alt = this._interp.adaptivePredict(this._input,71,this._ctx)
 	        while(_alt!=2 && _alt!=antlr4.atn.ATN.INVALID_ALT_NUMBER) {
 	            if(_alt===1) {
-	                this.state = 720;
+	                this.state = 710;
 	                this.match(FSHParser.KW_AND);
-	                this.state = 721;
+	                this.state = 711;
 	                this.name(); 
 	            }
-	            this.state = 726;
+	            this.state = 716;
 	            this._errHandler.sync(this);
-	            _alt = this._interp.adaptivePredict(this._input,73,this._ctx);
+	            _alt = this._interp.adaptivePredict(this._input,71,this._ctx);
 	        }
 
 	    } catch (re) {
@@ -3256,17 +3230,17 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 727;
+	        this.state = 717;
 	        this.vsFilterDefinition();
-	        this.state = 732;
+	        this.state = 722;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while(_la===38) {
-	            this.state = 728;
+	            this.state = 718;
 	            this.match(FSHParser.KW_AND);
-	            this.state = 729;
+	            this.state = 719;
 	            this.vsFilterDefinition();
-	            this.state = 734;
+	            this.state = 724;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -3292,15 +3266,15 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 735;
+	        this.state = 725;
 	        this.name();
-	        this.state = 736;
+	        this.state = 726;
 	        this.vsFilterOperator();
-	        this.state = 738;
+	        this.state = 728;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(((((_la - 42)) & ~0x1f) === 0 && ((1 << (_la - 42)) & 537985027) !== 0)) {
-	            this.state = 737;
+	            this.state = 727;
 	            this.vsFilterValue();
 	        }
 
@@ -3326,7 +3300,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 740;
+	        this.state = 730;
 	        _la = this._input.LA(1);
 	        if(!(_la===53 || _la===73)) {
 	        this._errHandler.recoverInline(this);
@@ -3355,32 +3329,32 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new VsFilterValueContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 142, FSHParser.RULE_vsFilterValue);
 	    try {
-	        this.state = 747;
+	        this.state = 737;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 62:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 742;
+	            this.state = 732;
 	            this.code();
 	            break;
 	        case 42:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 743;
+	            this.state = 733;
 	            this.match(FSHParser.KW_TRUE);
 	            break;
 	        case 43:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 744;
+	            this.state = 734;
 	            this.match(FSHParser.KW_FALSE);
 	            break;
 	        case 71:
 	            this.enterOuterAlt(localctx, 4);
-	            this.state = 745;
+	            this.state = 735;
 	            this.match(FSHParser.REGEX);
 	            break;
 	        case 58:
 	            this.enterOuterAlt(localctx, 5);
-	            this.state = 746;
+	            this.state = 736;
 	            this.match(FSHParser.STRING);
 	            break;
 	        default:
@@ -3408,7 +3382,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 749;
+	        this.state = 739;
 	        _la = this._input.LA(1);
 	        if(!((((_la) & ~0x1f) === 0 && ((1 << _la) & 2080374784) !== 0) || ((((_la - 46)) & ~0x1f) === 0 && ((1 << (_la - 46)) & 134234125) !== 0))) {
 	        this._errHandler.recoverInline(this);
@@ -3437,17 +3411,17 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new PathContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 146, FSHParser.RULE_path);
 	    try {
-	        this.state = 754;
+	        this.state = 744;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 73:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 751;
+	            this.state = 741;
 	            this.match(FSHParser.SEQUENCE);
 	            break;
 	        case 60:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 752;
+	            this.state = 742;
 	            this.match(FSHParser.NUMBER);
 	            break;
 	        case 26:
@@ -3472,7 +3446,7 @@ export default class FSHParser extends antlr4.Parser {
 	        case 49:
 	        case 52:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 753;
+	            this.state = 743;
 	            this.mostAlphaKeywords();
 	            break;
 	        default:
@@ -3499,7 +3473,7 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 148, FSHParser.RULE_caretPath);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 756;
+	        this.state = 746;
 	        this.match(FSHParser.CARET_SEQUENCE);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -3523,7 +3497,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 758;
+	        this.state = 748;
 	        _la = this._input.LA(1);
 	        if(!((((_la) & ~0x1f) === 0 && ((1 << _la) & 2113929216) !== 0))) {
 	        this._errHandler.recoverInline(this);
@@ -3554,7 +3528,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 760;
+	        this.state = 750;
 	        _la = this._input.LA(1);
 	        if(!(((((_la - 32)) & ~0x1f) === 0 && ((1 << (_la - 32)) & 15) !== 0))) {
 	        this._errHandler.recoverInline(this);
@@ -3583,79 +3557,79 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new ValueContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 154, FSHParser.RULE_value);
 	    try {
-	        this.state = 774;
+	        this.state = 764;
 	        this._errHandler.sync(this);
-	        var la_ = this._interp.adaptivePredict(this._input,78,this._ctx);
+	        var la_ = this._interp.adaptivePredict(this._input,76,this._ctx);
 	        switch(la_) {
 	        case 1:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 762;
+	            this.state = 752;
 	            this.match(FSHParser.STRING);
 	            break;
 
 	        case 2:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 763;
+	            this.state = 753;
 	            this.match(FSHParser.MULTILINE_STRING);
 	            break;
 
 	        case 3:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 764;
+	            this.state = 754;
 	            this.match(FSHParser.NUMBER);
 	            break;
 
 	        case 4:
 	            this.enterOuterAlt(localctx, 4);
-	            this.state = 765;
+	            this.state = 755;
 	            this.match(FSHParser.DATETIME);
 	            break;
 
 	        case 5:
 	            this.enterOuterAlt(localctx, 5);
-	            this.state = 766;
+	            this.state = 756;
 	            this.match(FSHParser.TIME);
 	            break;
 
 	        case 6:
 	            this.enterOuterAlt(localctx, 6);
-	            this.state = 767;
+	            this.state = 757;
 	            this.reference();
 	            break;
 
 	        case 7:
 	            this.enterOuterAlt(localctx, 7);
-	            this.state = 768;
+	            this.state = 758;
 	            this.canonical();
 	            break;
 
 	        case 8:
 	            this.enterOuterAlt(localctx, 8);
-	            this.state = 769;
+	            this.state = 759;
 	            this.code();
 	            break;
 
 	        case 9:
 	            this.enterOuterAlt(localctx, 9);
-	            this.state = 770;
+	            this.state = 760;
 	            this.quantity();
 	            break;
 
 	        case 10:
 	            this.enterOuterAlt(localctx, 10);
-	            this.state = 771;
+	            this.state = 761;
 	            this.ratio();
 	            break;
 
 	        case 11:
 	            this.enterOuterAlt(localctx, 11);
-	            this.state = 772;
+	            this.state = 762;
 	            this.bool();
 	            break;
 
 	        case 12:
 	            this.enterOuterAlt(localctx, 12);
-	            this.state = 773;
+	            this.state = 763;
 	            this.name();
 	            break;
 
@@ -3682,27 +3656,27 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 776;
+	        this.state = 766;
 	        this.name();
-	        this.state = 779;
+	        this.state = 769;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===37) {
-	            this.state = 777;
+	            this.state = 767;
 	            this.match(FSHParser.KW_NAMED);
-	            this.state = 778;
+	            this.state = 768;
 	            this.name();
 	        }
 
-	        this.state = 781;
+	        this.state = 771;
 	        this.match(FSHParser.CARD);
-	        this.state = 785;
+	        this.state = 775;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        while((((_la) & ~0x1f) === 0 && ((1 << _la) & 2113929216) !== 0)) {
-	            this.state = 782;
+	            this.state = 772;
 	            this.flag();
-	            this.state = 787;
+	            this.state = 777;
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        }
@@ -3728,13 +3702,13 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 788;
+	        this.state = 778;
 	        this.match(FSHParser.CODE);
-	        this.state = 790;
+	        this.state = 780;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58) {
-	            this.state = 789;
+	            this.state = 779;
 	            this.match(FSHParser.STRING);
 	        }
 
@@ -3760,31 +3734,31 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 792;
+	        this.state = 782;
 	        this.match(FSHParser.STAR);
-	        this.state = 794; 
+	        this.state = 784; 
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        do {
-	            this.state = 793;
+	            this.state = 783;
 	            this.match(FSHParser.CODE);
-	            this.state = 796; 
+	            this.state = 786; 
 	            this._errHandler.sync(this);
 	            _la = this._input.LA(1);
 	        } while(_la===62);
-	        this.state = 799;
+	        this.state = 789;
 	        this._errHandler.sync(this);
-	        var la_ = this._interp.adaptivePredict(this._input,83,this._ctx);
+	        var la_ = this._interp.adaptivePredict(this._input,81,this._ctx);
 	        if(la_===1) {
-	            this.state = 798;
+	            this.state = 788;
 	            this.match(FSHParser.STRING);
 
 	        }
-	        this.state = 802;
+	        this.state = 792;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58 || _la===59) {
-	            this.state = 801;
+	            this.state = 791;
 	            _la = this._input.LA(1);
 	            if(!(_la===58 || _la===59)) {
 	            this._errHandler.recoverInline(this);
@@ -3817,9 +3791,9 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 804;
+	        this.state = 794;
 	        this.match(FSHParser.NUMBER);
-	        this.state = 805;
+	        this.state = 795;
 	        _la = this._input.LA(1);
 	        if(!(_la===61 || _la===62)) {
 	        this._errHandler.recoverInline(this);
@@ -3828,11 +3802,11 @@ export default class FSHParser extends antlr4.Parser {
 	        	this._errHandler.reportMatch(this);
 	            this.consume();
 	        }
-	        this.state = 807;
+	        this.state = 797;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58) {
-	            this.state = 806;
+	            this.state = 796;
 	            this.match(FSHParser.STRING);
 	        }
 
@@ -3857,11 +3831,11 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 164, FSHParser.RULE_ratio);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 809;
+	        this.state = 799;
 	        this.ratioPart();
-	        this.state = 810;
+	        this.state = 800;
 	        this.match(FSHParser.COLON);
-	        this.state = 811;
+	        this.state = 801;
 	        this.ratioPart();
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -3885,13 +3859,13 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 813;
+	        this.state = 803;
 	        this.match(FSHParser.REFERENCE);
-	        this.state = 815;
+	        this.state = 805;
 	        this._errHandler.sync(this);
 	        _la = this._input.LA(1);
 	        if(_la===58) {
-	            this.state = 814;
+	            this.state = 804;
 	            this.match(FSHParser.STRING);
 	        }
 
@@ -3916,7 +3890,7 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 168, FSHParser.RULE_referenceType);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 817;
+	        this.state = 807;
 	        this.match(FSHParser.REFERENCE);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -3939,7 +3913,7 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 170, FSHParser.RULE_codeableReferenceType);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 819;
+	        this.state = 809;
 	        this.match(FSHParser.CODEABLE_REFERENCE);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -3962,7 +3936,7 @@ export default class FSHParser extends antlr4.Parser {
 	    this.enterRule(localctx, 172, FSHParser.RULE_canonical);
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 821;
+	        this.state = 811;
 	        this.match(FSHParser.CANONICAL);
 	    } catch (re) {
 	    	if(re instanceof antlr4.error.RecognitionException) {
@@ -3984,19 +3958,19 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new RatioPartContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 174, FSHParser.RULE_ratioPart);
 	    try {
-	        this.state = 825;
+	        this.state = 815;
 	        this._errHandler.sync(this);
-	        var la_ = this._interp.adaptivePredict(this._input,87,this._ctx);
+	        var la_ = this._interp.adaptivePredict(this._input,85,this._ctx);
 	        switch(la_) {
 	        case 1:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 823;
+	            this.state = 813;
 	            this.match(FSHParser.NUMBER);
 	            break;
 
 	        case 2:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 824;
+	            this.state = 814;
 	            this.quantity();
 	            break;
 
@@ -4023,7 +3997,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 827;
+	        this.state = 817;
 	        _la = this._input.LA(1);
 	        if(!(_la===42 || _la===43)) {
 	        this._errHandler.recoverInline(this);
@@ -4052,7 +4026,7 @@ export default class FSHParser extends antlr4.Parser {
 	    let localctx = new TargetTypeContext(this, this._ctx, this.state);
 	    this.enterRule(localctx, 178, FSHParser.RULE_targetType);
 	    try {
-	        this.state = 833;
+	        this.state = 823;
 	        this._errHandler.sync(this);
 	        switch(this._input.LA(1)) {
 	        case 26:
@@ -4066,22 +4040,22 @@ export default class FSHParser extends antlr4.Parser {
 	        case 60:
 	        case 73:
 	            this.enterOuterAlt(localctx, 1);
-	            this.state = 829;
+	            this.state = 819;
 	            this.name();
 	            break;
 	        case 67:
 	            this.enterOuterAlt(localctx, 2);
-	            this.state = 830;
+	            this.state = 820;
 	            this.referenceType();
 	            break;
 	        case 69:
 	            this.enterOuterAlt(localctx, 3);
-	            this.state = 831;
+	            this.state = 821;
 	            this.canonical();
 	            break;
 	        case 68:
 	            this.enterOuterAlt(localctx, 4);
-	            this.state = 832;
+	            this.state = 822;
 	            this.codeableReferenceType();
 	            break;
 	        default:
@@ -4109,7 +4083,7 @@ export default class FSHParser extends antlr4.Parser {
 	    var _la = 0;
 	    try {
 	        this.enterOuterAlt(localctx, 1);
-	        this.state = 835;
+	        this.state = 825;
 	        _la = this._input.LA(1);
 	        if(!(((((_la - 26)) & ~0x1f) === 0 && ((1 << (_la - 26)) & 83885119) !== 0))) {
 	        this._errHandler.recoverInline(this);
@@ -5497,10 +5471,18 @@ class VsRuleContext extends antlr4.ParserRuleContext {
 	    return this.getTypedRuleContext(CaretValueRuleContext,0);
 	};
 
+	codeCaretValueRule() {
+	    return this.getTypedRuleContext(CodeCaretValueRuleContext,0);
+	};
+
 	insertRule() {
 	    return this.getTypedRuleContext(InsertRuleContext,0);
 	};
 
+	codeInsertRule() {
+	    return this.getTypedRuleContext(CodeInsertRuleContext,0);
+	};
+
 	enterRule(listener) {
 	    if(listener instanceof FSHListener ) {
 	        listener.enterVsRule(this);
@@ -8200,33 +8182,14 @@ class VsConceptComponentContext extends antlr4.ParserRuleContext {
         this.ruleIndex = FSHParser.RULE_vsConceptComponent;
     }
 
-	code = function(i) {
-	    if(i===undefined) {
-	        i = null;
-	    }
-	    if(i===null) {
-	        return this.getTypedRuleContexts(CodeContext);
-	    } else {
-	        return this.getTypedRuleContext(CodeContext,i);
-	    }
+	code() {
+	    return this.getTypedRuleContext(CodeContext,0);
 	};
 
 	vsComponentFrom() {
 	    return this.getTypedRuleContext(VsComponentFromContext,0);
 	};
 
-	KW_AND = function(i) {
-		if(i===undefined) {
-			i = null;
-		}
-	    if(i===null) {
-	        return this.getTokens(FSHParser.KW_AND);
-	    } else {
-	        return this.getToken(FSHParser.KW_AND, i);
-	    }
-	};
-
-
 	enterRule(listener) {
 	    if(listener instanceof FSHListener ) {
 	        listener.enterVsConceptComponent(this);
diff --git a/src/import/parserContexts.ts b/src/import/parserContexts.ts
index b315f4f..c380188 100644
--- a/src/import/parserContexts.ts
+++ b/src/import/parserContexts.ts
@@ -78,7 +78,9 @@ export interface VsMetadataContext extends ParserRuleContext {
 export interface VsRuleContext extends ParserRuleContext {
   vsComponent(): VsComponentContext;
   caretValueRule(): CaretValueRuleContext;
+  codeCaretValueRule(): CodeCaretValueRuleContext;
   insertRule(): InsertRuleContext;
+  codeInsertRule(): CodeInsertRuleContext;
 }
 
 export interface CodeSystemContext extends ParserRuleContext {
@@ -505,7 +507,7 @@ export interface VsComponentContext extends ParserRuleContext {
 }
 
 export interface VsConceptComponentContext extends ParserRuleContext {
-  code(): CodeContext[];
+  code(): CodeContext;
   vsComponentFrom(): VsComponentFromContext;
 }
 


Test patch:
diff --git a/test/export/ValueSetExporter.test.ts b/test/export/ValueSetExporter.test.ts
index ec532a2..12098cd 100644
--- a/test/export/ValueSetExporter.test.ts
+++ b/test/export/ValueSetExporter.test.ts
@@ -1871,6 +1871,335 @@ describe('ValueSetExporter', () => {
     expect(exported[0].compose.include[0].system).toBe('http://food.net/CodeSystem/FoodCS');
   });
 
+  it('should apply a CaretValueRule at an included concept', () => {
+    const valueSet = new FshValueSet('DinnerVS');
+    const component = new ValueSetConceptComponentRule(true);
+    component.from = { system: 'http://food.org/food' };
+    component.concepts.push(
+      new FshCode('Pizza', 'http://food.org/food', 'Delicious pizza to share.')
+    );
+    component.concepts.push(
+      new FshCode('Salad', 'http://food.org/food', 'Plenty of fresh vegetables.')
+    );
+    component.concepts.push(new FshCode('Mulch', 'http://food.org/food'));
+    const designation = new CaretValueRule('');
+    designation.caretPath = 'designation.value';
+    designation.pathArray = ['http://food.org/food#Salad'];
+    designation.value = 'ensalada';
+    valueSet.rules.push(component, designation);
+    doc.valueSets.set(valueSet.name, valueSet);
+    const exported = exporter.export().valueSets;
+    expect(exported.length).toBe(1);
+    expect(exported[0]).toEqual({
+      resourceType: 'ValueSet',
+      id: 'DinnerVS',
+      name: 'DinnerVS',
+      url: 'http://hl7.org/fhir/us/minimal/ValueSet/DinnerVS',
+      status: 'draft',
+      compose: {
+        include: [
+          {
+            system: 'http://food.org/food',
+            concept: [
+              {
+                code: 'Pizza',
+                display: 'Delicious pizza to share.'
+              },
+              {
+                code: 'Salad',
+                display: 'Plenty of fresh vegetables.',
+                designation: [{ value: 'ensalada' }]
+              },
+              { code: 'Mulch' }
+            ]
+          }
+        ]
+      }
+    });
+    expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+  });
+
+  it('should apply a CaretValueRule at a concept from a code system defined in FSH identified by name', () => {
+    const foodCS = new FshCodeSystem('FoodCS');
+    foodCS.id = 'food';
+    foodCS.rules.push(new ConceptRule('Pizza', 'Delicious pizza to share.'));
+    foodCS.rules.push(new ConceptRule('Salad', 'Plenty of fresh vegetables.'));
+    doc.codeSystems.set(foodCS.name, foodCS);
+
+    const valueSet = new FshValueSet('DinnerVS');
+    const component = new ValueSetConceptComponentRule(true);
+    component.from = { system: 'FoodCS' };
+    component.concepts.push(new FshCode('Pizza', 'FoodCS', 'Delicious pizza to share.'));
+    component.concepts.push(new FshCode('Salad', 'FoodCS', 'Plenty of fresh vegetables.'));
+    const designation = new CaretValueRule('');
+    designation.caretPath = 'designation.value';
+    designation.pathArray = ['FoodCS#Salad'];
+    designation.value = 'ensalada';
+    valueSet.rules.push(component, designation);
+    doc.valueSets.set(valueSet.name, valueSet);
+    const exported = exporter.export().valueSets;
+    expect(exported.length).toBe(1);
+    expect(exported[0]).toEqual({
+      resourceType: 'ValueSet',
+      id: 'DinnerVS',
+      name: 'DinnerVS',
+      url: 'http://hl7.org/fhir/us/minimal/ValueSet/DinnerVS',
+      status: 'draft',
+      compose: {
+        include: [
+          {
+            system: 'http://hl7.org/fhir/us/minimal/CodeSystem/food',
+            concept: [
+              {
+                code: 'Pizza',
+                display: 'Delicious pizza to share.'
+              },
+              {
+                code: 'Salad',
+                display: 'Plenty of fresh vegetables.',
+                designation: [{ value: 'ensalada' }]
+              }
+            ]
+          }
+        ]
+      }
+    });
+    expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+  });
+
+  it('should apply a CaretValueRule at a concept from a code system defined in FSH identified by id', () => {
+    const foodCS = new FshCodeSystem('FoodCS');
+    foodCS.id = 'food';
+    foodCS.rules.push(new ConceptRule('Pizza', 'Delicious pizza to share.'));
+    foodCS.rules.push(new ConceptRule('Salad', 'Plenty of fresh vegetables.'));
+    doc.codeSystems.set(foodCS.name, foodCS);
+
+    const valueSet = new FshValueSet('DinnerVS');
+    const component = new ValueSetConceptComponentRule(true);
+    component.from = { system: 'FoodCS' };
+    component.concepts.push(new FshCode('Pizza', 'FoodCS', 'Delicious pizza to share.'));
+    component.concepts.push(new FshCode('Salad', 'FoodCS', 'Plenty of fresh vegetables.'));
+    const designation = new CaretValueRule('');
+    designation.caretPath = 'designation.value';
+    designation.pathArray = ['food#Salad'];
+    designation.value = 'ensalada';
+    valueSet.rules.push(component, designation);
+    doc.valueSets.set(valueSet.name, valueSet);
+    const exported = exporter.export().valueSets;
+    expect(exported.length).toBe(1);
+    expect(exported[0]).toEqual({
+      resourceType: 'ValueSet',
+      id: 'DinnerVS',
+      name: 'DinnerVS',
+      url: 'http://hl7.org/fhir/us/minimal/ValueSet/DinnerVS',
+      status: 'draft',
+      compose: {
+        include: [
+          {
+            system: 'http://hl7.org/fhir/us/minimal/CodeSystem/food',
+            concept: [
+              {
+                code: 'Pizza',
+                display: 'Delicious pizza to share.'
+              },
+              {
+                code: 'Salad',
+                display: 'Plenty of fresh vegetables.',
+                designation: [{ value: 'ensalada' }]
+              }
+            ]
+          }
+        ]
+      }
+    });
+    expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+  });
+
+  it('should apply a CaretValueRule at an excluded concept', () => {
+    const valueSet = new FshValueSet('DinnerVS');
+    const included = new ValueSetConceptComponentRule(true);
+    included.from = { system: 'http://food.org/food' };
+    included.concepts.push(
+      new FshCode('Pizza', 'http://food.org/food', 'Delicious pizza to share.')
+    );
+    included.concepts.push(
+      new FshCode('Salad', 'http://food.org/food', 'Plenty of fresh vegetables.')
+    );
+    const excluded = new ValueSetConceptComponentRule(false);
+    excluded.from = { system: 'http://food.org/food' };
+    excluded.concepts.push(new FshCode('Mulch', 'http://food.org/food'));
+    const designation = new CaretValueRule('');
+    designation.caretPath = 'designation.value';
+    designation.pathArray = ['http://food.org/food#Mulch'];
+    designation.value = 'mantillo';
+    valueSet.rules.push(included, excluded, designation);
+    doc.valueSets.set(valueSet.name, valueSet);
+    const exported = exporter.export().valueSets;
+    expect(exported.length).toBe(1);
+    expect(exported[0]).toEqual({
+      resourceType: 'ValueSet',
+      id: 'DinnerVS',
+      name: 'DinnerVS',
+      url: 'http://hl7.org/fhir/us/minimal/ValueSet/DinnerVS',
+      status: 'draft',
+      compose: {
+        include: [
+          {
+            system: 'http://food.org/food',
+            concept: [
+              {
+                code: 'Pizza',
+                display: 'Delicious pizza to share.'
+              },
+              {
+                code: 'Salad',
+                display: 'Plenty of fresh vegetables.'
+              }
+            ]
+          }
+        ],
+        exclude: [
+          {
+            system: 'http://food.org/food',
+            concept: [
+              {
+                code: 'Mulch',
+                designation: [{ value: 'mantillo' }]
+              }
+            ]
+          }
+        ]
+      }
+    });
+    expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+  });
+
+  it('should apply a CaretValueRule that assigns an instance at a concept', () => {
+    const valueSet = new FshValueSet('DinnerVS');
+    const component = new ValueSetConceptComponentRule(true);
+    component.from = { system: 'http://food.org/food' };
+    component.concepts.push(
+      new FshCode('Pizza', 'http://food.org/food', 'Delicious pizza to share.')
+    );
+    component.concepts.push(
+      new FshCode('Salad', 'http://food.org/food', 'Plenty of fresh vegetables.')
+    );
+    component.concepts.push(new FshCode('Mulch', 'http://food.org/food'));
+    const designationValue = new CaretValueRule('');
+    designationValue.caretPath = 'designation.value';
+    designationValue.pathArray = ['http://food.org/food#Salad'];
+    designationValue.value = 'ensalada';
+    const designationExtension = new CaretValueRule('');
+    designationExtension.caretPath = 'designation.extension';
+    designationExtension.pathArray = ['http://food.org/food#Salad'];
+    designationExtension.value = 'SomeDesignation';
+    designationExtension.isInstance = true;
+    valueSet.rules.push(component, designationValue, designationExtension);
+    doc.valueSets.set(valueSet.name, valueSet);
+    // Instance: SomeDesignation
+    // InstanceOf: data-absent-reason
+    // Usage: #inline
+    // * valueCode = #as-text
+    const designationInstance = new Instance('SomeDesignation');
+    designationInstance.instanceOf = 'data-absent-reason';
+    designationInstance.usage = 'Inline';
+    const extensionCode = new AssignmentRule('valueCode');
+    extensionCode.value = new FshCode('as-text');
+    designationInstance.rules.push(extensionCode);
+    doc.instances.set(designationInstance.name, designationInstance);
+
+    const exported = exporter.export().valueSets;
+    expect(exported.length).toBe(1);
+    expect(exported[0]).toEqual({
+      resourceType: 'ValueSet',
+      id: 'DinnerVS',
+      name: 'DinnerVS',
+      url: 'http://hl7.org/fhir/us/minimal/ValueSet/DinnerVS',
+      status: 'draft',
+      compose: {
+        include: [
+          {
+            system: 'http://food.org/food',
+            concept: [
+              {
+                code: 'Pizza',
+                display: 'Delicious pizza to share.'
+              },
+              {
+                code: 'Salad',
+                display: 'Plenty of fresh vegetables.',
+                designation: [
+                  {
+                    value: 'ensalada',
+                    extension: [
+                      {
+                        url: 'http://hl7.org/fhir/StructureDefinition/data-absent-reason',
+                        valueCode: 'as-text'
+                      }
+                    ]
+                  }
+                ]
+              },
+              { code: 'Mulch' }
+            ]
+          }
+        ]
+      }
+    });
+    expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+  });
+
+  it('should log an error when a CaretValueRule is applied at a concept that is neither included nor excluded', () => {
+    const valueSet = new FshValueSet('DinnerVS');
+    const component = new ValueSetConceptComponentRule(true);
+    component.from = { system: 'http://food.org/food' };
+    component.concepts.push(
+      new FshCode('Pizza', 'http://food.org/food', 'Delicious pizza to share.')
+    );
+    component.concepts.push(
+      new FshCode('Salad', 'http://food.org/food', 'Plenty of fresh vegetables.')
+    );
+    component.concepts.push(new FshCode('Mulch', 'http://food.org/food'));
+    const designation = new CaretValueRule('').withFile('ValueSet.fsh').withLocation([4, 3, 4, 29]);
+    designation.caretPath = 'designation.value';
+    designation.pathArray = ['http://food.org/food#Bread'];
+    designation.value = 'pan';
+    valueSet.rules.push(component, designation);
+    doc.valueSets.set(valueSet.name, valueSet);
+    const exported = exporter.export().valueSets;
+    expect(exported.length).toBe(1);
+    expect(exported[0]).toEqual({
+      resourceType: 'ValueSet',
+      id: 'DinnerVS',
+      name: 'DinnerVS',
+      url: 'http://hl7.org/fhir/us/minimal/ValueSet/DinnerVS',
+      status: 'draft',
+      compose: {
+        include: [
+          {
+            system: 'http://food.org/food',
+            concept: [
+              {
+                code: 'Pizza',
+                display: 'Delicious pizza to share.'
+              },
+              {
+                code: 'Salad',
+                display: 'Plenty of fresh vegetables.'
+              },
+              { code: 'Mulch' }
+            ]
+          }
+        ]
+      }
+    });
+    expect(loggerSpy.getAllMessages('error')).toHaveLength(1);
+    expect(loggerSpy.getLastMessage('error')).toMatch(
+      'Could not find concept http://food.org/food#Bread, skipping rule.'
+    );
+    expect(loggerSpy.getLastMessage('error')).toMatch(/File: ValueSet\.fsh.*Line: 4\D*/s);
+  });
+
   describe('#insertRules', () => {
     let vs: FshValueSet;
     let ruleSet: RuleSet;
diff --git a/test/import/FSHImporter.ValueSet.test.ts b/test/import/FSHImporter.ValueSet.test.ts
index 2c3934f..b424f81 100644
--- a/test/import/FSHImporter.ValueSet.test.ts
+++ b/test/import/FSHImporter.ValueSet.test.ts
@@ -251,38 +251,11 @@ describe('FSHImporter', () => {
         ]);
       });
 
-      it('should parse a value set with a list of concepts', () => {
-        const input = leftAlign(`
-        ValueSet: ZooVS
-        * #hippo "Hippopotamus" and #crocodile "Crocodile" from system ZOO
-        `);
-
-        const result = importSingleText(input, 'Zoo.fsh');
-        expect(result.valueSets.size).toBe(1);
-        const valueSet = result.valueSets.get('ZooVS');
-        expect(valueSet.rules.length).toBe(1);
-        assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
-          new FshCode('hippo', 'ZOO', 'Hippopotamus')
-            .withLocation([3, 3, 3, 23])
-            .withFile('Zoo.fsh'),
-          new FshCode('crocodile', 'ZOO', 'Crocodile')
-            .withLocation([3, 29, 3, 50])
-            .withFile('Zoo.fsh')
-        ]);
-        expect(valueSet.sourceInfo.location).toEqual({
-          startLine: 2,
-          startColumn: 1,
-          endLine: 3,
-          endColumn: 66
-        });
-        expect(valueSet.sourceInfo.file).toBe('Zoo.fsh');
-      });
-
       it('should merge concept rules when possible', () => {
         const input = leftAlign(`
         ValueSet: ZooVS
         * ZOO#hippo "Hippopotamus"
-        * #crocodile "Crocodile" and #emu "Emu" from system ZOO
+        * #crocodile "Crocodile" from system ZOO
         * ZOO#alligator "Alligator" from valueset ReptileVS
         * CRYPTID#jackalope "Jackalope"
         * exclude ZOO#lion "Lion"
@@ -299,8 +272,7 @@ describe('FSHImporter', () => {
             .withFile('Zoo.fsh'),
           new FshCode('crocodile', 'ZOO', 'Crocodile')
             .withLocation([4, 3, 4, 24])
-            .withFile('Zoo.fsh'),
-          new FshCode('emu', 'ZOO', 'Emu').withLocation([4, 30, 4, 39]).withFile('Zoo.fsh')
+            .withFile('Zoo.fsh')
         ]);
         assertValueSetConceptComponent(
           valueSet.rules[1],
@@ -353,20 +325,6 @@ describe('FSHImporter', () => {
         expect(loggerSpy.getLastMessage('error')).toMatch(/File: Zoo\.fsh.*Line: 3\D*/s);
       });
 
-      it('should log an error when a concept component with a list of concepts does not have a system', () => {
-        const input = leftAlign(`
-        ValueSet: ZooVS
-        * #hippo "Hippopotamus" and #crocodile "Crocodile"
-        `);
-
-        const result = importSingleText(input, 'Zoo.fsh');
-        expect(result.valueSets.size).toBe(1);
-        const valueSet = result.valueSets.get('ZooVS');
-        expect(valueSet.rules.length).toBe(1);
-        assertValueSetConceptComponent(valueSet.rules[0], undefined, undefined, []);
-        expect(loggerSpy.getLastMessage('error')).toMatch(/File: Zoo\.fsh.*Line: 3\D*/s);
-      });
-
       it('should log an error when a concept component has a system specified more than once', () => {
         const input = leftAlign(`
         ValueSet: ZooVS
@@ -389,22 +347,6 @@ describe('FSHImporter', () => {
         expect(loggerSpy.getLastMessage('error')).toMatch(/no viable alternative/s);
         expect(loggerSpy.getLastMessage('error')).toMatch(/File: Zoo\.fsh.*Line: 3\D*/s);
       });
-
-      it('should log an error when concepts are listed with commas', () => {
-        const input = leftAlign(`
-        ValueSet: ZooVS
-        * #hippo, #crocodile , #emu from system ZOO
-        `);
-
-        const result = importSingleText(input, 'Deprecated.fsh');
-        expect(result.valueSets.size).toBe(1);
-        const valueSet = result.valueSets.get('ZooVS');
-        expect(valueSet).toBeDefined();
-        expect(loggerSpy.getFirstMessage('error')).toMatch(
-          /Using ',' to list items is no longer supported/s
-        );
-        expect(loggerSpy.getFirstMessage('error')).toMatch(/File: Deprecated\.fsh.*Line: 3\D*/s);
-      });
     });
 
     describe('#ValueSetFilterComponent', () => {
@@ -1235,6 +1177,56 @@ describe('FSHImporter', () => {
       });
     });
 
+    describe('#ValueSetCodeCaretRule', () => {
+      it('should parse a value set with a code caret rule', () => {
+        const input = leftAlign(`
+        ValueSet: ZooVS
+        * ZOO#hippo "Hippopotamus"
+        * ZOO#hippo ^designation.value = "hipopótamo"
+        `);
+        const result = importSingleText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.rules.length).toBe(2);
+        assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+          new FshCode('hippo', 'ZOO', 'Hippopotamus')
+            .withLocation([3, 3, 3, 26])
+            .withFile('Zoo.fsh')
+        ]);
+        assertCaretValueRule(valueSet.rules[1], '', 'designation.value', 'hipopótamo', false, [
+          'ZOO#hippo'
+        ]);
+        expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+      });
+
+      it('should log an error when a caret rule has more than one concept', () => {
+        // ValueSet: ZooVS
+        // * ZOO#hippo "Hippopotamus"
+        // * ZOO#rhino "Rhinoceros"
+        // * ZOO#hippo ZOO#rhino ^designation.value = "hipopótamo"
+        const input = leftAlign(`
+        ValueSet: ZooVS
+        * ZOO#hippo "Hippopotamus"
+        * ZOO#rhino "Rhinoceros"
+        * ZOO#hippo ZOO#rhino ^designation.value = "hipopótamo"
+        `);
+        const result = importSingleText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.rules.length).toBe(1);
+        assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+          new FshCode('hippo', 'ZOO', 'Hippopotamus')
+            .withLocation([3, 3, 3, 26])
+            .withFile('Zoo.fsh'),
+          new FshCode('rhino', 'ZOO', 'Rhinoceros').withLocation([4, 3, 4, 24]).withFile('Zoo.fsh')
+        ]);
+        expect(loggerSpy.getAllMessages('error')).toHaveLength(1);
+        expect(loggerSpy.getLastMessage('error')).toMatch(
+          /Only one concept may be listed before a caret rule on a ValueSet\..*File: Zoo\.fsh.*Line: 5\D*/s
+        );
+      });
+    });
+
     describe('#insertRule', () => {
       it('should parse an insert rule with a single RuleSet', () => {
         const input = leftAlign(`
@@ -1244,7 +1236,37 @@ describe('FSHImporter', () => {
         const result = importSingleText(input, 'Insert.fsh');
         const vs = result.valueSets.get('MyVS');
         expect(vs.rules).toHaveLength(1);
-        assertInsertRule(vs.rules[0] as Rule, '', 'MyRuleSet');
+        assertInsertRule(vs.rules[0], '', 'MyRuleSet');
+      });
+
+      it('should parse an insert rule at a concept', () => {
+        const input = leftAlign(`
+        ValueSet: ZooVS
+        * ZOO#hippo
+        * ZOO#hippo insert DesignationRules
+        `);
+        const result = importSingleText(input, 'Insert.fsh');
+        const vs = result.valueSets.get('ZooVS');
+        expect(vs.rules).toHaveLength(2);
+        assertValueSetConceptComponent(vs.rules[0], 'ZOO', undefined, [
+          new FshCode('hippo', 'ZOO').withFile('Insert.fsh').withLocation([3, 3, 3, 11])
+        ]);
+        assertInsertRule(vs.rules[1], '', 'DesignationRules', [], ['ZOO#hippo']);
+        expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+      });
+
+      it('should log an error when an insert rule has more than one concept', () => {
+        const input = leftAlign(`
+        ValueSet: ZooVS
+        * ZOO#hippo ZOO#big-hippo insert DesignationRules
+        `);
+        const result = importSingleText(input, 'Insert.fsh');
+        const vs = result.valueSets.get('ZooVS');
+        expect(vs.rules).toHaveLength(0);
+        expect(loggerSpy.getAllMessages('error')).toHaveLength(1);
+        expect(loggerSpy.getLastMessage('error')).toMatch(
+          /Only one concept may be listed before an insert rule on a ValueSet\..*File: Insert\.fsh.*Line: 3\D*/s
+        );
       });
     });
   });
diff --git a/test/import/FSHImporter.context.test.ts b/test/import/FSHImporter.context.test.ts
index eb7f8d5..06dbe08 100644
--- a/test/import/FSHImporter.context.test.ts
+++ b/test/import/FSHImporter.context.test.ts
@@ -1027,5 +1027,239 @@ describe('FSHImporter', () => {
       expect(codeSystem.rules[1].sourceInfo.file).toBe('Zoo.fsh');
       expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
     });
+
+    it('should parse a value set that uses an indented CaretValueRule after a ValueSetConceptComponentRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * ZOO#hippo "Hippopotamus"
+        * ^designation.value = "hipopótamo"
+        * ^designation.language = "es"
+      * include ZOO#anteater "Anteater"
+        * ^designation.value = "fourmilier"
+        * ^designation.language = "fr"
+      * exclude ZOO#bear "Bear"
+        * ^designation.value = "oso"
+        * ^designation.language = "es"
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(8);
+      assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+        new FshCode('hippo', 'ZOO', 'Hippopotamus').withLocation([3, 3, 3, 26]).withFile('Zoo.fsh'),
+        new FshCode('anteater', 'ZOO', 'Anteater').withLocation([6, 11, 6, 33]).withFile('Zoo.fsh')
+      ]);
+      assertCaretValueRule(valueSet.rules[1], '', 'designation.value', 'hipopótamo', false, [
+        'ZOO#hippo'
+      ]);
+      assertCaretValueRule(valueSet.rules[2], '', 'designation.language', 'es', false, [
+        'ZOO#hippo'
+      ]);
+      assertCaretValueRule(valueSet.rules[3], '', 'designation.value', 'fourmilier', false, [
+        'ZOO#anteater'
+      ]);
+      assertCaretValueRule(valueSet.rules[4], '', 'designation.language', 'fr', false, [
+        'ZOO#anteater'
+      ]);
+      assertCaretValueRule(valueSet.rules[6], '', 'designation.value', 'oso', false, ['ZOO#bear']);
+      assertCaretValueRule(valueSet.rules[7], '', 'designation.language', 'es', false, [
+        'ZOO#bear'
+      ]);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+    });
+
+    it('should parse a value set that uses an indented CaretValueRule after a ValueSetConceptComponentRule with the from keyword', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * #hippo "Hippopotamus" from system ZOO
+        * ^designation.value = "hipopótamo"
+        * ^designation.language = "es"
+      * include #anteater "Anteater" from system ZOO
+        * ^designation.value = "fourmilier"
+        * ^designation.language = "fr"
+      * exclude #bear "Bear" from system ZOO
+        * ^designation.value = "oso"
+        * ^designation.language = "es"
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(8);
+      assertCaretValueRule(valueSet.rules[1], '', 'designation.value', 'hipopótamo', false, [
+        'ZOO#hippo'
+      ]);
+      assertCaretValueRule(valueSet.rules[2], '', 'designation.language', 'es', false, [
+        'ZOO#hippo'
+      ]);
+      assertCaretValueRule(valueSet.rules[3], '', 'designation.value', 'fourmilier', false, [
+        'ZOO#anteater'
+      ]);
+      assertCaretValueRule(valueSet.rules[4], '', 'designation.language', 'fr', false, [
+        'ZOO#anteater'
+      ]);
+      assertCaretValueRule(valueSet.rules[6], '', 'designation.value', 'oso', false, ['ZOO#bear']);
+      assertCaretValueRule(valueSet.rules[7], '', 'designation.language', 'es', false, [
+        'ZOO#bear'
+      ]);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+    });
+
+    it('should parse a value set that uses an indented InsertRule after a ValueSetConceptComponentRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * ZOO#hippo "Hippopotamus"
+        * insert MyRuleSet
+      * include ZOO#anteater "Anteater"
+        * insert OtherRuleSet
+      * exclude ZOO#bear "Bear"
+        * insert ThirdRuleSet
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(5);
+      assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+        new FshCode('hippo', 'ZOO', 'Hippopotamus').withLocation([3, 3, 3, 26]).withFile('Zoo.fsh'),
+        new FshCode('anteater', 'ZOO', 'Anteater').withLocation([5, 11, 5, 33]).withFile('Zoo.fsh')
+      ]);
+      assertInsertRule(valueSet.rules[1], 'ZOO#hippo', 'MyRuleSet', [], ['ZOO#hippo']);
+      assertInsertRule(valueSet.rules[2], 'ZOO#anteater', 'OtherRuleSet', [], ['ZOO#anteater']);
+      assertValueSetConceptComponent(
+        valueSet.rules[3],
+        'ZOO',
+        undefined,
+        [new FshCode('bear', 'ZOO', 'Bear').withFile('Zoo.fsh').withLocation([7, 11, 7, 25])],
+        false
+      );
+      assertInsertRule(valueSet.rules[4], 'ZOO#bear', 'ThirdRuleSet', [], ['ZOO#bear']);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+    });
+
+    it('should parse a value set that uses a root-level CaretValueRule after a ValueSetConceptComponentRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * ZOO#hippo "Hippopotamus"
+      * ^publisher = "foo"
+      * include ZOO#anteater "Anteater"
+      * ^immutable = false
+      * exclude ZOO#bear "Bear"
+      * ^purpose = "We like animals."
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(5);
+      assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+        new FshCode('hippo', 'ZOO', 'Hippopotamus').withFile('Zoo.fsh').withLocation([3, 3, 3, 26]),
+        new FshCode('anteater', 'ZOO', 'Anteater').withLocation([5, 11, 5, 33]).withFile('Zoo.fsh')
+      ]);
+      assertCaretValueRule(valueSet.rules[1], '', 'publisher', 'foo', false, []);
+      assertCaretValueRule(valueSet.rules[2], '', 'immutable', false, false, []);
+      assertValueSetConceptComponent(
+        valueSet.rules[3],
+        'ZOO',
+        undefined,
+        [new FshCode('bear', 'ZOO', 'Bear').withFile('Zoo.fsh').withLocation([7, 11, 7, 25])],
+        false
+      );
+      assertCaretValueRule(valueSet.rules[4], '', 'purpose', 'We like animals.', false, []);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+    });
+
+    it('should parse a value set that uses a root-level CaretValueRule after a concept-level CaretValueRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * ZOO#hippo "Hippopotamus"
+      * ZOO#hippo ^designation.value = "hipopótamo"
+      * ^publisher = "foo"
+      * include ZOO#anteater "Anteater"
+      * ZOO#anteater ^designation.value = "fourmilier"
+      * ^immutable = false
+      * exclude ZOO#bear "Bear"
+        * ^designation.value = "oso"
+      * ^purpose = "We like animals."
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(8);
+      assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+        new FshCode('hippo', 'ZOO', 'Hippopotamus').withFile('Zoo.fsh').withLocation([3, 3, 3, 26]),
+        new FshCode('anteater', 'ZOO', 'Anteater').withFile('Zoo.fsh').withLocation([6, 11, 6, 33])
+      ]);
+      assertCaretValueRule(valueSet.rules[1], '', 'designation.value', 'hipopótamo', false, [
+        'ZOO#hippo'
+      ]);
+      assertCaretValueRule(valueSet.rules[2], '', 'publisher', 'foo', false, []);
+      assertCaretValueRule(valueSet.rules[3], '', 'designation.value', 'fourmilier', false, [
+        'ZOO#anteater'
+      ]);
+      assertCaretValueRule(valueSet.rules[4], '', 'immutable', false, false, []);
+      assertValueSetConceptComponent(
+        valueSet.rules[5],
+        'ZOO',
+        undefined,
+        [new FshCode('bear', 'ZOO', 'Bear').withFile('Zoo.fsh').withLocation([9, 11, 9, 25])],
+        false
+      );
+      assertCaretValueRule(valueSet.rules[6], '', 'designation.value', 'oso', false, ['ZOO#bear']);
+      assertCaretValueRule(valueSet.rules[7], '', 'purpose', 'We like animals.', false, []);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(0);
+    });
+
+    it('should log an error when parsing a value set that uses an indented CaretValueRule after a ValueSetFilterComponentRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * include codes from system ZOO
+        * ^inactive = true
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(2);
+      assertValueSetFilterComponent(valueSet.rules[0], 'ZOO', undefined, []);
+      assertCaretValueRule(valueSet.rules[1], '', 'inactive', true, false);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(1);
+      expect(loggerSpy.getLastMessage('error')).toMatch(
+        /Rule cannot be indented below rule which has no path.*File: Zoo\.fsh.*Line: 4\D*/s
+      );
+    });
+
+    it('should log an error when parsing a value set that uses an indented InsertRule after a ValueSetFilterComponentRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * include codes from system ZOO
+        * insert MyRuleSet
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(2);
+      assertValueSetFilterComponent(valueSet.rules[0], 'ZOO', undefined, []);
+      assertInsertRule(valueSet.rules[1], '', 'MyRuleSet');
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(1);
+      expect(loggerSpy.getLastMessage('error')).toMatch(
+        /Rule cannot be indented below rule which has no path.*File: Zoo\.fsh.*Line: 4\D*/s
+      );
+    });
+
+    it('should log an error when parsing a value set that uses an indented InsertRule with a concept after a ValueSetConceptComponentRule', () => {
+      const input = leftAlign(`
+      ValueSet: ZooVS
+      * ZOO#hippo "Hippopotamus"
+        * ZOO#big-hippo insert MyRuleSet
+      `);
+      const result = importSingleText(input, 'Zoo.fsh');
+      expect(result.valueSets.size).toBe(1);
+      const valueSet = result.valueSets.get('ZooVS');
+      expect(valueSet.rules.length).toBe(1);
+      assertValueSetConceptComponent(valueSet.rules[0], 'ZOO', undefined, [
+        new FshCode('hippo', 'ZOO', 'Hippopotamus').withLocation([3, 3, 3, 26]).withFile('Zoo.fsh')
+      ]);
+      expect(loggerSpy.getAllMessages('error')).toHaveLength(1);
+      expect(loggerSpy.getLastMessage('error')).toMatch(
+        /Only one concept may be listed before an insert rule on a ValueSet\..*File: Zoo\.fsh.*Line: 4\D*/s
+      );
+    });
   });
 });