Repository: FHIR/sushi
Pull request #68 (2019-12-30 15:20:35)

Import ValueSet
A ValueSet is defined as a set of included and excluded components. There are two types of components: concept components, which specify one or more concepts, and filter components, which use filter expressions to specify concepts. http://hl7.org/fhir/valueset-definitions.html#ValueSet.compose.include has the relevant details about what can get included in a ValueSet. http://hl7.org/fhir/valueset-filter-operator.html describes the set of filter operators that can be used in a filter expression.

SUSHI is not responsible for expanding ValueSet definitions. As a result, filter expressions do not get evaluated to the greatest possible degree. For example, SUSHI does not determine the elements of a comma-separated list used as a filter value.

Because this feature has a lot of associated grammar definitions, please also consider in your review the usability of the grammar for writing ValueSet specifications.

This pull request addresses https://standardhealthrecord.atlassian.net/browse/CIMPL-150.

mint-thompson: New test cases added, including a test for using the `exists` operator and omitting the value.
ngfreiter: I had just one response to a comment above that I want to clear up, and I also think it may be a good idea to add a test for a case where the `and` is used:
```
* codes from system SCT where 
    code is-a SCT#399983006 and
    code is-not-a SCT#399983006
```
I call out this case because I noticed previously that when running SUSHI on fsh-mcode, https://github.com/standardhealth/fsh-mcode, this case did cause an error. I think you've made changes to fix that error, but better safe than sorry.

Patch:
diff --git a/antlr/src/main/antlr/FSH.g4 b/antlr/src/main/antlr/FSH.g4
index abc907f..6067132 100644
--- a/antlr/src/main/antlr/FSH.g4
+++ b/antlr/src/main/antlr/FSH.g4
@@ -16,7 +16,7 @@ instanceMetadata:   instanceOf | title;
 invariant:          KW_INVARIANT SEQUENCE invariantMetadata+;
 invariantMetadata:  description | expression | xpath | severity;
 
-valueSet:           KW_VALUESET SEQUENCE vsMetadata* vsComponent+;
+valueSet:           KW_VALUESET SEQUENCE vsMetadata* vsComponent*;
 vsMetadata:         id | title | description;
 codeSystem:         KW_CODESYSTEM SEQUENCE csMetadata* concept*;
 csMetadata:         id | title | description;
@@ -49,11 +49,11 @@ vsConceptComponent: code vsComponentFrom?
 vsFilterComponent:  KW_CODES vsComponentFrom (KW_WHERE vsFilterList)?;
 vsComponentFrom:    KW_FROM (vsFromSystem (KW_AND vsFromValueset)? | vsFromValueset (KW_AND vsFromSystem)?);
 vsFromSystem:       KW_SYSTEM SEQUENCE;
-vsFromValueset:     KW_VSREFERENCE COMMA_DELIMITED_SEQUENCES;
-vsFilterList:       (vsFilterDefinition KW_AND)+ vsFilterDefinition;
-vsFilterDefinition: SEQUENCE vsFilterOperator vsFilterValue;
+vsFromValueset:     KW_VSREFERENCE (SEQUENCE | COMMA_DELIMITED_SEQUENCES);
+vsFilterList:       (vsFilterDefinition KW_AND)* vsFilterDefinition;
+vsFilterDefinition: SEQUENCE vsFilterOperator vsFilterValue?;
 vsFilterOperator:   EQUAL | SEQUENCE;
-vsFilterValue:      code | REGEX | COMMA_DELIMITED_SEQUENCES | SEQUENCE;
+vsFilterValue:      code | KW_TRUE | KW_FALSE | REGEX | STRING;
 
 // MISC
 path:               SEQUENCE;
diff --git a/src/errors/ValueSetFilterMissingValueError.ts b/src/errors/ValueSetFilterMissingValueError.ts
new file mode 100644
index 0000000..49d1c3e
--- /dev/null
+++ b/src/errors/ValueSetFilterMissingValueError.ts
@@ -0,0 +1,7 @@
+import { VsOperator } from '../fshtypes';
+
+export class ValueSetFilterMissingValueError extends Error {
+  constructor(public operator: VsOperator) {
+    super(`Not applying value set filter: missing value for operator "${operator}".`);
+  }
+}
diff --git a/src/errors/ValueSetFilterOperatorError.ts b/src/errors/ValueSetFilterOperatorError.ts
new file mode 100644
index 0000000..1d88abe
--- /dev/null
+++ b/src/errors/ValueSetFilterOperatorError.ts
@@ -0,0 +1,8 @@
+import { Annotated } from './Annotated';
+
+export class ValueSetFilterOperatorError extends Error implements Annotated {
+  specReferences = ['https://www.hl7.org/fhir/valueset-filter-operator.html'];
+  constructor(public value: string) {
+    super(`Operator "${value}" not available in value set filter.`);
+  }
+}
diff --git a/src/errors/ValueSetFilterPropertyError.ts b/src/errors/ValueSetFilterPropertyError.ts
new file mode 100644
index 0000000..73ed4dd
--- /dev/null
+++ b/src/errors/ValueSetFilterPropertyError.ts
@@ -0,0 +1,5 @@
+export class ValueSetFilterPropertyError extends Error {
+  constructor(public value: string) {
+    super(`Property "${value}" not available in value set filter.`);
+  }
+}
diff --git a/src/errors/ValueSetFilterValueTypeError.ts b/src/errors/ValueSetFilterValueTypeError.ts
new file mode 100644
index 0000000..5bb3025
--- /dev/null
+++ b/src/errors/ValueSetFilterValueTypeError.ts
@@ -0,0 +1,12 @@
+import { VsOperator } from '../fshtypes';
+
+export class ValueSetFilterValueTypeError extends Error {
+  constructor(
+    public operator: VsOperator,
+    public expectedType: 'string' | 'regex' | 'boolean' | 'code'
+  ) {
+    super(
+      `Not applying value set filter: operator "${operator}" requires a ${expectedType} value.`
+    );
+  }
+}
diff --git a/src/errors/index.ts b/src/errors/index.ts
index ab9df91..87515cf 100644
--- a/src/errors/index.ts
+++ b/src/errors/index.ts
@@ -13,6 +13,10 @@ export * from './InvalidPeriodError';
 export * from './InvalidRangeValueError';
 export * from './InvalidTypeError';
 export * from './RequiredMetadataError';
+export * from './ValueSetFilterPropertyError';
+export * from './ValueSetFilterOperatorError';
+export * from './ValueSetFilterMissingValueError';
+export * from './ValueSetFilterValueTypeError';
 export * from './SlicingDefinitionError';
 export * from './SlicingNotDefinedError';
 export * from './TypeNotFoundError';
diff --git a/src/fshtypes/ValueSet.ts b/src/fshtypes/ValueSet.ts
index 4bfdfca..030fc5f 100644
--- a/src/fshtypes/ValueSet.ts
+++ b/src/fshtypes/ValueSet.ts
@@ -7,15 +7,13 @@ import { ValueSetComponent } from './ValueSetComponent';
  */
 export class ValueSet extends FshEntity {
   id: string;
-  url?: string;
+  title?: string;
   description?: string;
-  inclusions: ValueSetComponent[];
-  exclusions: ValueSetComponent[];
+  components: ValueSetComponent[];
 
   constructor(public name: string) {
     super();
     this.id = name;
-    this.inclusions = [];
-    this.exclusions = [];
+    this.components = [];
   }
 }
diff --git a/src/fshtypes/ValueSetComponent.ts b/src/fshtypes/ValueSetComponent.ts
index 5dd9c63..7fa9b72 100644
--- a/src/fshtypes/ValueSetComponent.ts
+++ b/src/fshtypes/ValueSetComponent.ts
@@ -1,38 +1,47 @@
 import { FshEntity } from './FshEntity';
+import { FshCode } from './FshCode';
 
 export class ValueSetComponent extends FshEntity {
-  public system?: string;
-  public rule?: ValueSetConcept | ValueSetFilter | ValueSetReference;
-
-  public withSystem(system: string): ValueSetComponent {
-    this.system = system;
-    return this;
+  public from: ValueSetComponentFrom = {};
+  constructor(public inclusion: boolean) {
+    super();
   }
+}
 
-  public withRule(rule: ValueSetConcept | ValueSetFilter | ValueSetReference): ValueSetComponent {
-    this.rule = rule;
-    return this;
-  }
+export class ValueSetConceptComponent extends ValueSetComponent {
+  public concepts: FshCode[] = [];
 }
 
-export class ValueSetConcept {
-  public code: string;
-  public display: string;
+export class ValueSetFilterComponent extends ValueSetComponent {
+  public filters: ValueSetFilter[] = [];
+}
+
+export type ValueSetComponentFrom = {
+  system?: string;
+  valueSets?: string[];
+};
+
+export enum VsProperty {
+  SYSTEM = 'system',
+  VERSION = 'version',
+  CODE = 'code',
+  DISPLAY = 'display'
 }
 
-export class ValueSetFilter {
-  public property: string;
-  public op:
-    | '='
-    | 'is-a'
-    | 'descendant-of'
-    | 'is-not-a'
-    | 'regex'
-    | 'in'
-    | 'not-in'
-    | 'generalizes'
-    | 'exists';
-  public value: string;
+export enum VsOperator {
+  EQUALS = '=',
+  IS_A = 'is-a',
+  DESCENDENT_OF = 'descendent-of',
+  IS_NOT_A = 'is-not-a',
+  REGEX = 'regex',
+  IN = 'in',
+  NOT_IN = 'not-in',
+  GENERALIZES = 'generalizes',
+  EXISTS = 'exists'
 }
 
-export type ValueSetReference = string;
+export type ValueSetFilter = {
+  property: VsProperty;
+  operator: VsOperator;
+  value: string | RegExp | boolean | FshCode;
+};
diff --git a/src/import/FSHDocument.ts b/src/import/FSHDocument.ts
index d5e40b5..f660c89 100644
--- a/src/import/FSHDocument.ts
+++ b/src/import/FSHDocument.ts
@@ -1,15 +1,17 @@
-import { Profile, Extension, Instance } from '../fshtypes';
+import { Profile, Extension, Instance, ValueSet } from '../fshtypes';
 
 export class FSHDocument {
   readonly aliases: Map<string, string>;
   readonly profiles: Map<string, Profile>;
   readonly extensions: Map<string, Extension>;
   readonly instances: Map<string, Instance>;
+  readonly valueSets: Map<string, ValueSet>;
 
   constructor(public readonly file: string) {
     this.aliases = new Map();
     this.profiles = new Map();
     this.extensions = new Map();
     this.instances = new Map();
+    this.valueSets = new Map();
   }
 }
diff --git a/src/import/FSHImporter.ts b/src/import/FSHImporter.ts
index 0ece093..5abc5f3 100644
--- a/src/import/FSHImporter.ts
+++ b/src/import/FSHImporter.ts
@@ -8,7 +8,15 @@ import {
   FshQuantity,
   FshRatio,
   TextLocation,
-  Instance
+  Instance,
+  ValueSet,
+  ValueSetComponent,
+  ValueSetConceptComponent,
+  VsProperty,
+  ValueSetFilterComponent,
+  ValueSetComponentFrom,
+  ValueSetFilter,
+  VsOperator
 } from '../fshtypes';
 import {
   Rule,
@@ -24,7 +32,13 @@ import {
 import { ParserRuleContext } from 'antlr4';
 import { logger } from '../utils/FSHLogger';
 import { TerminalNode } from 'antlr4/tree/Tree';
-import { RequiredMetadataError } from '../errors';
+import {
+  RequiredMetadataError,
+  ValueSetFilterPropertyError,
+  ValueSetFilterOperatorError,
+  ValueSetFilterValueTypeError,
+  ValueSetFilterMissingValueError
+} from '../errors';
 
 enum SdMetadataKey {
   Id = 'Id',
@@ -40,6 +54,13 @@ enum InstanceMetadataKey {
   Unknown = 'Unknown'
 }
 
+enum VsMetadataKey {
+  Id = 'Id',
+  Title = 'Title',
+  Description = 'Description',
+  Unknown = 'Unknown'
+}
+
 enum Flag {
   MustSupport,
   Summary,
@@ -101,6 +122,10 @@ export class FSHImporter extends FSHVisitor {
     if (ctx.instance()) {
       this.visitInstance(ctx.instance());
     }
+
+    if (ctx.valueSet()) {
+      this.visitValueSet(ctx.valueSet());
+    }
   }
 
   visitAlias(ctx: pc.AliasContext): void {
@@ -205,6 +230,51 @@ export class FSHImporter extends FSHVisitor {
     });
   }
 
+  visitValueSet(ctx: pc.ValueSetContext) {
+    const valueSet = new ValueSet(ctx.SEQUENCE().getText())
+      .withLocation(this.extractStartStop(ctx))
+      .withFile(this.file);
+    this.parseValueSet(valueSet, ctx.vsMetadata(), ctx.vsComponent());
+    this.doc.valueSets.set(valueSet.name, valueSet);
+  }
+
+  private parseValueSet(
+    valueSet: ValueSet,
+    metaCtx: pc.VsMetadataContext[] = [],
+    componentCtx: pc.VsComponentContext[] = []
+  ) {
+    const seenPairs: Map<VsMetadataKey, string> = new Map();
+    metaCtx
+      .map(vsMetadata => ({
+        ...this.visitVsMetadata(vsMetadata),
+        context: vsMetadata
+      }))
+      .forEach(pair => {
+        if (seenPairs.has(pair.key)) {
+          logger.error(
+            `Metadata field '${pair.key}' already declared with value '${seenPairs.get(
+              pair.key
+            )}'.`,
+            { file: this.file, location: this.extractStartStop(pair.context) }
+          );
+          return;
+        }
+        seenPairs.set(pair.key, pair.value);
+        if (pair.key === VsMetadataKey.Id) {
+          valueSet.id = pair.value;
+        } else if (pair.key === VsMetadataKey.Title) {
+          valueSet.title = pair.value;
+        } else if (pair.key === VsMetadataKey.Description) {
+          valueSet.description = pair.value;
+        }
+      });
+    componentCtx
+      .map(vsComponentCtx => this.visitVsComponent(vsComponentCtx))
+      .forEach(vsComponent => {
+        valueSet.components.push(vsComponent);
+      });
+  }
+
   visitSdMetadata(ctx: pc.SdMetadataContext): { key: SdMetadataKey; value: string } {
     if (ctx.id()) {
       return { key: SdMetadataKey.Id, value: this.visitId(ctx.id()) };
@@ -229,6 +299,17 @@ export class FSHImporter extends FSHVisitor {
     return { key: InstanceMetadataKey.Unknown, value: ctx.getText() };
   }
 
+  visitVsMetadata(ctx: pc.VsMetadataContext): { key: VsMetadataKey; value: string } {
+    if (ctx.id()) {
+      return { key: VsMetadataKey.Id, value: this.visitId(ctx.id()) };
+    } else if (ctx.title()) {
+      return { key: VsMetadataKey.Title, value: this.visitTitle(ctx.title()) };
+    } else if (ctx.description()) {
+      return { key: VsMetadataKey.Description, value: this.visitDescription(ctx.description()) };
+    }
+    return { key: VsMetadataKey.Unknown, value: ctx.getText() };
+  }
+
   visitId(ctx: pc.IdContext): string {
     return ctx.SEQUENCE().getText();
   }
@@ -550,6 +631,217 @@ export class FSHImporter extends FSHVisitor {
     return caretValueRule;
   }
 
+  visitVsComponent(ctx: pc.VsComponentContext): ValueSetComponent {
+    const inclusion = ctx.KW_EXCLUDE() == null;
+    let vsComponent: ValueSetConceptComponent | ValueSetFilterComponent;
+    if (ctx.vsConceptComponent()) {
+      vsComponent = new ValueSetConceptComponent(inclusion);
+      [vsComponent.concepts, vsComponent.from] = this.visitVsConceptComponent(
+        ctx.vsConceptComponent()
+      );
+    } else if (ctx.vsFilterComponent()) {
+      vsComponent = new ValueSetFilterComponent(inclusion);
+      [vsComponent.filters, vsComponent.from] = this.visitVsFilterComponent(
+        ctx.vsFilterComponent()
+      );
+    }
+    return vsComponent;
+  }
+
+  visitVsConceptComponent(ctx: pc.VsConceptComponentContext): [FshCode[], ValueSetComponentFrom] {
+    const concepts: FshCode[] = [];
+    const from: ValueSetComponentFrom = ctx.vsComponentFrom()
+      ? this.visitVsComponentFrom(ctx.vsComponentFrom())
+      : {};
+    if (ctx.code()) {
+      const singleCode = this.visitCode(ctx.code());
+      if (singleCode.system && from.system) {
+        logger.error(`Concept ${singleCode.code} specifies system multiple times`, {
+          file: this.file,
+          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.file,
+            location: this.extractStartStop(ctx)
+          }
+        );
+      }
+    } else if (ctx.COMMA_DELIMITED_CODES()) {
+      const codes = ctx
+        .COMMA_DELIMITED_CODES()
+        .getText()
+        .split(/\s*,\s+#/);
+      codes[0] = codes[0].slice(1);
+      const location = this.extractStartStop(ctx.COMMA_DELIMITED_CODES());
+      codes.forEach(code => {
+        let codePart: string, description: string;
+        if (code.charAt(0) == '"') {
+          // codePart is a quoted string, just like description (if present).
+          [codePart, description] = code
+            .match(/"([^\s\\"]|\\"|\\\\)+(\s([^\s\\"]|\\"|\\\\)+)*"/g)
+            .map(quotedString => quotedString.slice(1, -1));
+        } else {
+          // codePart is not a quoted string.
+          // if there is a description after the code,
+          // it will be separated by whitespace before the leading "
+          const codeEnd = code.match(/\s+"/)?.index;
+          if (codeEnd) {
+            codePart = code.slice(0, codeEnd);
+            description = code
+              .slice(codeEnd)
+              .trim()
+              .slice(1, -1);
+          } else {
+            codePart = code.trim();
+          }
+        }
+        concepts.push(
+          new FshCode(codePart, from.system, description).withLocation(location).withFile(this.file)
+        );
+      });
+    }
+    return [concepts, from];
+  }
+
+  visitVsFilterComponent(
+    ctx: pc.VsFilterComponentContext
+  ): [ValueSetFilter[], ValueSetComponentFrom] {
+    const filters: ValueSetFilter[] = [];
+    const from: ValueSetComponentFrom = ctx.vsComponentFrom()
+      ? this.visitVsComponentFrom(ctx.vsComponentFrom())
+      : {};
+    if (ctx.vsFilterList()) {
+      ctx
+        .vsFilterList()
+        .vsFilterDefinition()
+        .forEach(filterDefinition => {
+          try {
+            filters.push(this.visitVsFilterDefinition(filterDefinition));
+          } catch (e) {
+            logger.error(e, {
+              location: this.extractStartStop(filterDefinition),
+              file: this.file
+            });
+          }
+        });
+    }
+    return [filters, from];
+  }
+
+  visitVsComponentFrom(ctx: pc.VsComponentFromContext): ValueSetComponentFrom {
+    const from: ValueSetComponentFrom = {};
+    if (ctx.vsFromSystem()) {
+      from.system = ctx
+        .vsFromSystem()
+        .SEQUENCE()
+        .getText();
+    }
+    if (ctx.vsFromValueset()) {
+      if (ctx.vsFromValueset().SEQUENCE()) {
+        from.valueSets = [
+          ctx
+            .vsFromValueset()
+            .SEQUENCE()
+            .getText()
+        ];
+      } else if (ctx.vsFromValueset().COMMA_DELIMITED_SEQUENCES()) {
+        from.valueSets = ctx
+          .vsFromValueset()
+          .COMMA_DELIMITED_SEQUENCES()
+          .getText()
+          .split(',')
+          .map(fromVs => fromVs.trim());
+      }
+    }
+    return from;
+  }
+
+  /**
+   * The replace makes FSH permissive in regards to the official specifications,
+   * which spells operator "descendant-of" as "descendent-of".
+   * @see {@link http://hl7.org/fhir/valueset-filter-operator.html}
+   */
+  visitVsFilterDefinition(ctx: pc.VsFilterDefinitionContext): ValueSetFilter {
+    const property = ctx
+      .SEQUENCE()
+      .getText()
+      .toLocaleLowerCase() as VsProperty;
+    if (Object.values(VsProperty).indexOf(property) < 0) {
+      throw new ValueSetFilterPropertyError(ctx.SEQUENCE().getText());
+    }
+    const operator = ctx
+      .vsFilterOperator()
+      .getText()
+      .toLocaleLowerCase()
+      .replace('descendant', 'descendent') as VsOperator;
+    if (ctx.vsFilterValue() == null && operator !== VsOperator.EXISTS) {
+      throw new ValueSetFilterMissingValueError(operator);
+    }
+    const value = ctx.vsFilterValue() ? this.visitVsFilterValue(ctx.vsFilterValue()) : true;
+    switch (operator) {
+      case VsOperator.EQUALS:
+      case VsOperator.IN:
+      case VsOperator.NOT_IN:
+        if (typeof value !== 'string') {
+          throw new ValueSetFilterValueTypeError(operator, 'string');
+        }
+        break;
+      case VsOperator.IS_A:
+      case VsOperator.DESCENDENT_OF:
+      case VsOperator.IS_NOT_A:
+      case VsOperator.GENERALIZES:
+        if (!(value instanceof FshCode)) {
+          throw new ValueSetFilterValueTypeError(operator, 'code');
+        }
+        break;
+      case VsOperator.REGEX:
+        if (!(value instanceof RegExp)) {
+          throw new ValueSetFilterValueTypeError(operator, 'regex');
+        }
+        break;
+      case VsOperator.EXISTS:
+        if (typeof value !== 'boolean') {
+          throw new ValueSetFilterValueTypeError(operator, 'boolean');
+        }
+        break;
+      default:
+        throw new ValueSetFilterOperatorError(ctx.vsFilterOperator().getText());
+    }
+    return {
+      property: property,
+      operator: operator,
+      value: value
+    };
+  }
+
+  visitVsFilterValue(ctx: pc.VsFilterValueContext): string | RegExp | boolean | FshCode {
+    if (ctx.code()) {
+      return this.visitCode(ctx.code());
+    } else if (ctx.REGEX()) {
+      return RegExp(
+        ctx
+          .REGEX()
+          .getText()
+          .slice(1, -1)
+      );
+    } else if (ctx.STRING()) {
+      return this.extractString(ctx.STRING());
+    } else if (ctx.KW_TRUE()) {
+      return true;
+    } else if (ctx.KW_FALSE()) {
+      return false;
+    }
+  }
+
   private aliasAwareValue(value: string): string {
     return this.doc.aliases.has(value) ? this.doc.aliases.get(value) : value;
   }
diff --git a/src/import/generated/FSH.interp b/src/import/generated/FSH.interp
index 5c075eb..4fc5515 100644
--- a/src/import/generated/FSH.interp
+++ b/src/import/generated/FSH.interp
@@ -177,4 +177,4 @@ targetType
 
 
 atn:
-[3, 24715, 42794, 33075, 47597, 16764, 15335, 30598, 22884, 3, 59, 456, 4, 2, 9, 2, 4, 3, 9, 3, 4, 4, 9, 4, 4, 5, 9, 5, 4, 6, 9, 6, 4, 7, 9, 7, 4, 8, 9, 8, 4, 9, 9, 9, 4, 10, 9, 10, 4, 11, 9, 11, 4, 12, 9, 12, 4, 13, 9, 13, 4, 14, 9, 14, 4, 15, 9, 15, 4, 16, 9, 16, 4, 17, 9, 17, 4, 18, 9, 18, 4, 19, 9, 19, 4, 20, 9, 20, 4, 21, 9, 21, 4, 22, 9, 22, 4, 23, 9, 23, 4, 24, 9, 24, 4, 25, 9, 25, 4, 26, 9, 26, 4, 27, 9, 27, 4, 28, 9, 28, 4, 29, 9, 29, 4, 30, 9, 30, 4, 31, 9, 31, 4, 32, 9, 32, 4, 33, 9, 33, 4, 34, 9, 34, 4, 35, 9, 35, 4, 36, 9, 36, 4, 37, 9, 37, 4, 38, 9, 38, 4, 39, 9, 39, 4, 40, 9, 40, 4, 41, 9, 41, 4, 42, 9, 42, 4, 43, 9, 43, 4, 44, 9, 44, 4, 45, 9, 45, 4, 46, 9, 46, 4, 47, 9, 47, 4, 48, 9, 48, 4, 49, 9, 49, 4, 50, 9, 50, 4, 51, 9, 51, 4, 52, 9, 52, 4, 53, 9, 53, 4, 54, 9, 54, 4, 55, 9, 55, 4, 56, 9, 56, 3, 2, 7, 2, 114, 10, 2, 12, 2, 14, 2, 117, 11, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 3, 126, 10, 3, 3, 4, 3, 4, 3, 4, 3, 4, 3, 4, 3, 5, 3, 5, 3, 5, 6, 5, 136, 10, 5, 13, 5, 14, 5, 137, 3, 5, 7, 5, 141, 10, 5, 12, 5, 14, 5, 144, 11, 5, 3, 6, 3, 6, 3, 6, 7, 6, 149, 10, 6, 12, 6, 14, 6, 152, 11, 6, 3, 6, 7, 6, 155, 10, 6, 12, 6, 14, 6, 158, 11, 6, 3, 7, 3, 7, 3, 7, 3, 7, 5, 7, 164, 10, 7, 3, 8, 3, 8, 3, 8, 3, 8, 3, 8, 3, 8, 3, 8, 3, 8, 5, 8, 174, 10, 8, 3, 9, 3, 9, 3, 9, 7, 9, 179, 10, 9, 12, 9, 14, 9, 182, 11, 9, 3, 9, 7, 9, 185, 10, 9, 12, 9, 14, 9, 188, 11, 9, 3, 10, 3, 10, 5, 10, 192, 10, 10, 3, 11, 3, 11, 3, 11, 6, 11, 197, 10, 11, 13, 11, 14, 11, 198, 3, 12, 3, 12, 3, 12, 3, 12, 5, 12, 205, 10, 12, 3, 13, 3, 13, 3, 13, 7, 13, 210, 10, 13, 12, 13, 14, 13, 213, 11, 13, 3, 13, 6, 13, 216, 10, 13, 13, 13, 14, 13, 217, 3, 14, 3, 14, 3, 14, 5, 14, 223, 10, 14, 3, 15, 3, 15, 3, 15, 7, 15, 228, 10, 15, 12, 15, 14, 15, 231, 11, 15, 3, 15, 7, 15, 234, 10, 15, 12, 15, 14, 15, 237, 11, 15, 3, 16, 3, 16, 3, 16, 5, 16, 242, 10, 16, 3, 17, 3, 17, 3, 17, 3, 18, 3, 18, 3, 18, 3, 19, 3, 19, 3, 19, 3, 20, 3, 20, 3, 20, 3, 21, 3, 21, 3, 21, 3, 22, 3, 22, 3, 22, 3, 23, 3, 23, 3, 23, 3, 24, 3, 24, 3, 24, 3, 25, 3, 25, 3, 25, 3, 25, 7, 25, 272, 10, 25, 12, 25, 14, 25, 275, 11, 25, 3, 26, 3, 26, 3, 26, 5, 26, 280, 10, 26, 3, 26, 6, 26, 283, 10, 26, 13, 26, 14, 26, 284, 3, 27, 3, 27, 3, 27, 3, 27, 3, 27, 5, 27, 292, 10, 27, 3, 28, 3, 28, 3, 28, 3, 28, 3, 28, 3, 29, 3, 29, 3, 29, 3, 29, 3, 29, 3, 29, 7, 29, 305, 10, 29, 12, 29, 14, 29, 308, 11, 29, 3, 30, 3, 30, 3, 30, 3, 30, 3, 30, 3, 30, 7, 30, 316, 10, 30, 12, 30, 14, 30, 319, 11, 30, 3, 31, 3, 31, 5, 31, 323, 10, 31, 3, 31, 3, 31, 3, 31, 3, 31, 7, 31, 329, 10, 31, 12, 31, 14, 31, 332, 11, 31, 3, 32, 3, 32, 5, 32, 336, 10, 32, 3, 32, 3, 32, 3, 32, 3, 32, 3, 33, 3, 33, 5, 33, 344, 10, 33, 3, 33, 3, 33, 5, 33, 348, 10, 33, 3, 34, 3, 34, 5, 34, 352, 10, 34, 3, 34, 3, 34, 5, 34, 356, 10, 34, 3, 35, 3, 35, 3, 35, 3, 35, 5, 35, 362, 10, 35, 3, 36, 3, 36, 3, 36, 3, 36, 5, 36, 368, 10, 36, 3, 36, 3, 36, 3, 36, 5, 36, 373, 10, 36, 5, 36, 375, 10, 36, 3, 37, 3, 37, 3, 37, 3, 38, 3, 38, 3, 38, 3, 39, 3, 39, 3, 39, 6, 39, 386, 10, 39, 13, 39, 14, 39, 387, 3, 39, 3, 39, 3, 40, 3, 40, 3, 40, 3, 40, 3, 41, 3, 41, 3, 42, 3, 42, 3, 42, 3, 42, 5, 42, 402, 10, 42, 3, 43, 3, 43, 3, 44, 3, 44, 3, 45, 3, 45, 3, 46, 3, 46, 3, 47, 3, 47, 3, 48, 3, 48, 3, 48, 3, 48, 3, 48, 3, 48, 3, 48, 3, 48, 3, 48, 5, 48, 423, 10, 48, 3, 49, 3, 49, 3, 49, 7, 49, 428, 10, 49, 12, 49, 14, 49, 431, 11, 49, 3, 50, 3, 50, 5, 50, 435, 10, 50, 3, 51, 3, 51, 5, 51, 439, 10, 51, 3, 52, 3, 52, 3, 52, 3, 53, 3, 53, 3, 53, 3, 53, 3, 54, 3, 54, 5, 54, 450, 10, 54, 3, 55, 3, 55, 3, 56, 3, 56, 3, 56, 2, 2, 57, 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, 2, 8, 3, 2, 42, 43, 4, 2, 38, 38, 56, 56, 3, 2, 18, 20, 3, 2, 22, 25, 3, 2, 31, 32, 4, 2, 51, 51, 56, 56, 2, 469, 2, 115, 3, 2, 2, 2, 4, 125, 3, 2, 2, 2, 6, 127, 3, 2, 2, 2, 8, 132, 3, 2, 2, 2, 10, 145, 3, 2, 2, 2, 12, 163, 3, 2, 2, 2, 14, 173, 3, 2, 2, 2, 16, 175, 3, 2, 2, 2, 18, 191, 3, 2, 2, 2, 20, 193, 3, 2, 2, 2, 22, 204, 3, 2, 2, 2, 24, 206, 3, 2, 2, 2, 26, 222, 3, 2, 2, 2, 28, 224, 3, 2, 2, 2, 30, 241, 3, 2, 2, 2, 32, 243, 3, 2, 2, 2, 34, 246, 3, 2, 2, 2, 36, 249, 3, 2, 2, 2, 38, 252, 3, 2, 2, 2, 40, 255, 3, 2, 2, 2, 42, 258, 3, 2, 2, 2, 44, 261, 3, 2, 2, 2, 46, 264, 3, 2, 2, 2, 48, 267, 3, 2, 2, 2, 50, 276, 3, 2, 2, 2, 52, 286, 3, 2, 2, 2, 54, 293, 3, 2, 2, 2, 56, 298, 3, 2, 2, 2, 58, 309, 3, 2, 2, 2, 60, 320, 3, 2, 2, 2, 62, 333, 3, 2, 2, 2, 64, 341, 3, 2, 2, 2, 66, 355, 3, 2, 2, 2, 68, 357, 3, 2, 2, 2, 70, 363, 3, 2, 2, 2, 72, 376, 3, 2, 2, 2, 74, 379, 3, 2, 2, 2, 76, 385, 3, 2, 2, 2, 78, 391, 3, 2, 2, 2, 80, 395, 3, 2, 2, 2, 82, 401, 3, 2, 2, 2, 84, 403, 3, 2, 2, 2, 86, 405, 3, 2, 2, 2, 88, 407, 3, 2, 2, 2, 90, 409, 3, 2, 2, 2, 92, 411, 3, 2, 2, 2, 94, 422, 3, 2, 2, 2, 96, 424, 3, 2, 2, 2, 98, 432, 3, 2, 2, 2, 100, 436, 3, 2, 2, 2, 102, 440, 3, 2, 2, 2, 104, 443, 3, 2, 2, 2, 106, 449, 3, 2, 2, 2, 108, 451, 3, 2, 2, 2, 110, 453, 3, 2, 2, 2, 112, 114, 5, 4, 3, 2, 113, 112, 3, 2, 2, 2, 114, 117, 3, 2, 2, 2, 115, 113, 3, 2, 2, 2, 115, 116, 3, 2, 2, 2, 116, 3, 3, 2, 2, 2, 117, 115, 3, 2, 2, 2, 118, 126, 5, 6, 4, 2, 119, 126, 5, 8, 5, 2, 120, 126, 5, 10, 6, 2, 121, 126, 5, 20, 11, 2, 122, 126, 5, 16, 9, 2, 123, 126, 5, 24, 13, 2, 124, 126, 5, 28, 15, 2, 125, 118, 3, 2, 2, 2, 125, 119, 3, 2, 2, 2, 125, 120, 3, 2, 2, 2, 125, 121, 3, 2, 2, 2, 125, 122, 3, 2, 2, 2, 125, 123, 3, 2, 2, 2, 125, 124, 3, 2, 2, 2, 126, 5, 3, 2, 2, 2, 127, 128, 7, 3, 2, 2, 128, 129, 7, 56, 2, 2, 129, 130, 7, 38, 2, 2, 130, 131, 7, 56, 2, 2, 131, 7, 3, 2, 2, 2, 132, 133, 7, 4, 2, 2, 133, 135, 7, 56, 2, 2, 134, 136, 5, 12, 7, 2, 135, 134, 3, 2, 2, 2, 136, 137, 3, 2, 2, 2, 137, 135, 3, 2, 2, 2, 137, 138, 3, 2, 2, 2, 138, 142, 3, 2, 2, 2, 139, 141, 5, 14, 8, 2, 140, 139, 3, 2, 2, 2, 141, 144, 3, 2, 2, 2, 142, 140, 3, 2, 2, 2, 142, 143, 3, 2, 2, 2, 143, 9, 3, 2, 2, 2, 144, 142, 3, 2, 2, 2, 145, 146, 7, 5, 2, 2, 146, 150, 7, 56, 2, 2, 147, 149, 5, 12, 7, 2, 148, 147, 3, 2, 2, 2, 149, 152, 3, 2, 2, 2, 150, 148, 3, 2, 2, 2, 150, 151, 3, 2, 2, 2, 151, 156, 3, 2, 2, 2, 152, 150, 3, 2, 2, 2, 153, 155, 5, 14, 8, 2, 154, 153, 3, 2, 2, 2, 155, 158, 3, 2, 2, 2, 156, 154, 3, 2, 2, 2, 156, 157, 3, 2, 2, 2, 157, 11, 3, 2, 2, 2, 158, 156, 3, 2, 2, 2, 159, 164, 5, 32, 17, 2, 160, 164, 5, 34, 18, 2, 161, 164, 5, 36, 19, 2, 162, 164, 5, 38, 20, 2, 163, 159, 3, 2, 2, 2, 163, 160, 3, 2, 2, 2, 163, 161, 3, 2, 2, 2, 163, 162, 3, 2, 2, 2, 164, 13, 3, 2, 2, 2, 165, 174, 5, 48, 25, 2, 166, 174, 5, 50, 26, 2, 167, 174, 5, 52, 27, 2, 168, 174, 5, 54, 28, 2, 169, 174, 5, 56, 29, 2, 170, 174, 5, 58, 30, 2, 171, 174, 5, 60, 31, 2, 172, 174, 5, 62, 32, 2, 173, 165, 3, 2, 2, 2, 173, 166, 3, 2, 2, 2, 173, 167, 3, 2, 2, 2, 173, 168, 3, 2, 2, 2, 173, 169, 3, 2, 2, 2, 173, 170, 3, 2, 2, 2, 173, 171, 3, 2, 2, 2, 173, 172, 3, 2, 2, 2, 174, 15, 3, 2, 2, 2, 175, 176, 7, 6, 2, 2, 176, 180, 7, 56, 2, 2, 177, 179, 5, 18, 10, 2, 178, 177, 3, 2, 2, 2, 179, 182, 3, 2, 2, 2, 180, 178, 3, 2, 2, 2, 180, 181, 3, 2, 2, 2, 181, 186, 3, 2, 2, 2, 182, 180, 3, 2, 2, 2, 183, 185, 5, 54, 28, 2, 184, 183, 3, 2, 2, 2, 185, 188, 3, 2, 2, 2, 186, 184, 3, 2, 2, 2, 186, 187, 3, 2, 2, 2, 187, 17, 3, 2, 2, 2, 188, 186, 3, 2, 2, 2, 189, 192, 5, 46, 24, 2, 190, 192, 5, 36, 19, 2, 191, 189, 3, 2, 2, 2, 191, 190, 3, 2, 2, 2, 192, 19, 3, 2, 2, 2, 193, 194, 7, 8, 2, 2, 194, 196, 7, 56, 2, 2, 195, 197, 5, 22, 12, 2, 196, 195, 3, 2, 2, 2, 197, 198, 3, 2, 2, 2, 198, 196, 3, 2, 2, 2, 198, 199, 3, 2, 2, 2, 199, 21, 3, 2, 2, 2, 200, 205, 5, 38, 20, 2, 201, 205, 5, 40, 21, 2, 202, 205, 5, 42, 22, 2, 203, 205, 5, 44, 23, 2, 204, 200, 3, 2, 2, 2, 204, 201, 3, 2, 2, 2, 204, 202, 3, 2, 2, 2, 204, 203, 3, 2, 2, 2, 205, 23, 3, 2, 2, 2, 206, 207, 7, 9, 2, 2, 207, 211, 7, 56, 2, 2, 208, 210, 5, 26, 14, 2, 209, 208, 3, 2, 2, 2, 210, 213, 3, 2, 2, 2, 211, 209, 3, 2, 2, 2, 211, 212, 3, 2, 2, 2, 212, 215, 3, 2, 2, 2, 213, 211, 3, 2, 2, 2, 214, 216, 5, 64, 33, 2, 215, 214, 3, 2, 2, 2, 216, 217, 3, 2, 2, 2, 217, 215, 3, 2, 2, 2, 217, 218, 3, 2, 2, 2, 218, 25, 3, 2, 2, 2, 219, 223, 5, 34, 18, 2, 220, 223, 5, 36, 19, 2, 221, 223, 5, 38, 20, 2, 222, 219, 3, 2, 2, 2, 222, 220, 3, 2, 2, 2, 222, 221, 3, 2, 2, 2, 223, 27, 3, 2, 2, 2, 224, 225, 7, 10, 2, 2, 225, 229, 7, 56, 2, 2, 226, 228, 5, 30, 16, 2, 227, 226, 3, 2, 2, 2, 228, 231, 3, 2, 2, 2, 229, 227, 3, 2, 2, 2, 229, 230, 3, 2, 2, 2, 230, 235, 3, 2, 2, 2, 231, 229, 3, 2, 2, 2, 232, 234, 5, 100, 51, 2, 233, 232, 3, 2, 2, 2, 234, 237, 3, 2, 2, 2, 235, 233, 3, 2, 2, 2, 235, 236, 3, 2, 2, 2, 236, 29, 3, 2, 2, 2, 237, 235, 3, 2, 2, 2, 238, 242, 5, 34, 18, 2, 239, 242, 5, 36, 19, 2, 240, 242, 5, 38, 20, 2, 241, 238, 3, 2, 2, 2, 241, 239, 3, 2, 2, 2, 241, 240, 3, 2, 2, 2, 242, 31, 3, 2, 2, 2, 243, 244, 7, 11, 2, 2, 244, 245, 7, 56, 2, 2, 245, 33, 3, 2, 2, 2, 246, 247, 7, 12, 2, 2, 247, 248, 7, 56, 2, 2, 248, 35, 3, 2, 2, 2, 249, 250, 7, 13, 2, 2, 250, 251, 7, 42, 2, 2, 251, 37, 3, 2, 2, 2, 252, 253, 7, 14, 2, 2, 253, 254, 9, 2, 2, 2, 254, 39, 3, 2, 2, 2, 255, 256, 7, 15, 2, 2, 256, 257, 7, 42, 2, 2, 257, 41, 3, 2, 2, 2, 258, 259, 7, 16, 2, 2, 259, 260, 7, 42, 2, 2, 260, 43, 3, 2, 2, 2, 261, 262, 7, 17, 2, 2, 262, 263, 7, 46, 2, 2, 263, 45, 3, 2, 2, 2, 264, 265, 7, 7, 2, 2, 265, 266, 7, 56, 2, 2, 266, 47, 3, 2, 2, 2, 267, 268, 7, 39, 2, 2, 268, 269, 5, 84, 43, 2, 269, 273, 7, 50, 2, 2, 270, 272, 5, 90, 46, 2, 271, 270, 3, 2, 2, 2, 272, 275, 3, 2, 2, 2, 273, 271, 3, 2, 2, 2, 273, 274, 3, 2, 2, 2, 274, 49, 3, 2, 2, 2, 275, 273, 3, 2, 2, 2, 276, 279, 7, 39, 2, 2, 277, 280, 5, 84, 43, 2, 278, 280, 5, 86, 44, 2, 279, 277, 3, 2, 2, 2, 279, 278, 3, 2, 2, 2, 280, 282, 3, 2, 2, 2, 281, 283, 5, 90, 46, 2, 282, 281, 3, 2, 2, 2, 283, 284, 3, 2, 2, 2, 284, 282, 3, 2, 2, 2, 284, 285, 3, 2, 2, 2, 285, 51, 3, 2, 2, 2, 286, 287, 7, 39, 2, 2, 287, 288, 5, 84, 43, 2, 288, 289, 7, 21, 2, 2, 289, 291, 7, 56, 2, 2, 290, 292, 5, 92, 47, 2, 291, 290, 3, 2, 2, 2, 291, 292, 3, 2, 2, 2, 292, 53, 3, 2, 2, 2, 293, 294, 7, 39, 2, 2, 294, 295, 5, 84, 43, 2, 295, 296, 7, 38, 2, 2, 296, 297, 5, 94, 48, 2, 297, 55, 3, 2, 2, 2, 298, 299, 7, 39, 2, 2, 299, 300, 5, 84, 43, 2, 300, 301, 7, 26, 2, 2, 301, 306, 5, 96, 49, 2, 302, 303, 7, 27, 2, 2, 303, 305, 5, 96, 49, 2, 304, 302, 3, 2, 2, 2, 305, 308, 3, 2, 2, 2, 306, 304, 3, 2, 2, 2, 306, 307, 3, 2, 2, 2, 307, 57, 3, 2, 2, 2, 308, 306, 3, 2, 2, 2, 309, 310, 7, 39, 2, 2, 310, 311, 5, 84, 43, 2, 311, 312, 7, 28, 2, 2, 312, 317, 5, 110, 56, 2, 313, 314, 7, 29, 2, 2, 314, 316, 5, 110, 56, 2, 315, 313, 3, 2, 2, 2, 316, 319, 3, 2, 2, 2, 317, 315, 3, 2, 2, 2, 317, 318, 3, 2, 2, 2, 318, 59, 3, 2, 2, 2, 319, 317, 3, 2, 2, 2, 320, 322, 7, 39, 2, 2, 321, 323, 5, 84, 43, 2, 322, 321, 3, 2, 2, 2, 322, 323, 3, 2, 2, 2, 323, 324, 3, 2, 2, 2, 324, 325, 7, 30, 2, 2, 325, 330, 7, 56, 2, 2, 326, 327, 7, 27, 2, 2, 327, 329, 7, 56, 2, 2, 328, 326, 3, 2, 2, 2, 329, 332, 3, 2, 2, 2, 330, 328, 3, 2, 2, 2, 330, 331, 3, 2, 2, 2, 331, 61, 3, 2, 2, 2, 332, 330, 3, 2, 2, 2, 333, 335, 7, 39, 2, 2, 334, 336, 5, 84, 43, 2, 335, 334, 3, 2, 2, 2, 335, 336, 3, 2, 2, 2, 336, 337, 3, 2, 2, 2, 337, 338, 5, 88, 45, 2, 338, 339, 7, 38, 2, 2, 339, 340, 5, 94, 48, 2, 340, 63, 3, 2, 2, 2, 341, 343, 7, 39, 2, 2, 342, 344, 7, 33, 2, 2, 343, 342, 3, 2, 2, 2, 343, 344, 3, 2, 2, 2, 344, 347, 3, 2, 2, 2, 345, 348, 5, 66, 34, 2, 346, 348, 5, 68, 35, 2, 347, 345, 3, 2, 2, 2, 347, 346, 3, 2, 2, 2, 348, 65, 3, 2, 2, 2, 349, 351, 5, 98, 50, 2, 350, 352, 5, 70, 36, 2, 351, 350, 3, 2, 2, 2, 351, 352, 3, 2, 2, 2, 352, 356, 3, 2, 2, 2, 353, 354, 7, 54, 2, 2, 354, 356, 5, 70, 36, 2, 355, 349, 3, 2, 2, 2, 355, 353, 3, 2, 2, 2, 356, 67, 3, 2, 2, 2, 357, 358, 7, 34, 2, 2, 358, 361, 5, 70, 36, 2, 359, 360, 7, 35, 2, 2, 360, 362, 5, 76, 39, 2, 361, 359, 3, 2, 2, 2, 361, 362, 3, 2, 2, 2, 362, 69, 3, 2, 2, 2, 363, 374, 7, 21, 2, 2, 364, 367, 5, 72, 37, 2, 365, 366, 7, 27, 2, 2, 366, 368, 5, 74, 38, 2, 367, 365, 3, 2, 2, 2, 367, 368, 3, 2, 2, 2, 368, 375, 3, 2, 2, 2, 369, 372, 5, 74, 38, 2, 370, 371, 7, 27, 2, 2, 371, 373, 5, 72, 37, 2, 372, 370, 3, 2, 2, 2, 372, 373, 3, 2, 2, 2, 373, 375, 3, 2, 2, 2, 374, 364, 3, 2, 2, 2, 374, 369, 3, 2, 2, 2, 375, 71, 3, 2, 2, 2, 376, 377, 7, 37, 2, 2, 377, 378, 7, 56, 2, 2, 378, 73, 3, 2, 2, 2, 379, 380, 7, 36, 2, 2, 380, 381, 7, 55, 2, 2, 381, 75, 3, 2, 2, 2, 382, 383, 5, 78, 40, 2, 383, 384, 7, 27, 2, 2, 384, 386, 3, 2, 2, 2, 385, 382, 3, 2, 2, 2, 386, 387, 3, 2, 2, 2, 387, 385, 3, 2, 2, 2, 387, 388, 3, 2, 2, 2, 388, 389, 3, 2, 2, 2, 389, 390, 5, 78, 40, 2, 390, 77, 3, 2, 2, 2, 391, 392, 7, 56, 2, 2, 392, 393, 5, 80, 41, 2, 393, 394, 5, 82, 42, 2, 394, 79, 3, 2, 2, 2, 395, 396, 9, 3, 2, 2, 396, 81, 3, 2, 2, 2, 397, 402, 5, 98, 50, 2, 398, 402, 7, 53, 2, 2, 399, 402, 7, 55, 2, 2, 400, 402, 7, 56, 2, 2, 401, 397, 3, 2, 2, 2, 401, 398, 3, 2, 2, 2, 401, 399, 3, 2, 2, 2, 401, 400, 3, 2, 2, 2, 402, 83, 3, 2, 2, 2, 403, 404, 7, 56, 2, 2, 404, 85, 3, 2, 2, 2, 405, 406, 7, 55, 2, 2, 406, 87, 3, 2, 2, 2, 407, 408, 7, 52, 2, 2, 408, 89, 3, 2, 2, 2, 409, 410, 9, 4, 2, 2, 410, 91, 3, 2, 2, 2, 411, 412, 9, 5, 2, 2, 412, 93, 3, 2, 2, 2, 413, 423, 7, 42, 2, 2, 414, 423, 7, 43, 2, 2, 415, 423, 7, 44, 2, 2, 416, 423, 7, 48, 2, 2, 417, 423, 7, 49, 2, 2, 418, 423, 5, 98, 50, 2, 419, 423, 5, 102, 52, 2, 420, 423, 5, 104, 53, 2, 421, 423, 5, 108, 55, 2, 422, 413, 3, 2, 2, 2, 422, 414, 3, 2, 2, 2, 422, 415, 3, 2, 2, 2, 422, 416, 3, 2, 2, 2, 422, 417, 3, 2, 2, 2, 422, 418, 3, 2, 2, 2, 422, 419, 3, 2, 2, 2, 422, 420, 3, 2, 2, 2, 422, 421, 3, 2, 2, 2, 423, 95, 3, 2, 2, 2, 424, 425, 7, 56, 2, 2, 425, 429, 7, 50, 2, 2, 426, 428, 5, 90, 46, 2, 427, 426, 3, 2, 2, 2, 428, 431, 3, 2, 2, 2, 429, 427, 3, 2, 2, 2, 429, 430, 3, 2, 2, 2, 430, 97, 3, 2, 2, 2, 431, 429, 3, 2, 2, 2, 432, 434, 7, 46, 2, 2, 433, 435, 7, 42, 2, 2, 434, 433, 3, 2, 2, 2, 434, 435, 3, 2, 2, 2, 435, 99, 3, 2, 2, 2, 436, 438, 5, 98, 50, 2, 437, 439, 7, 42, 2, 2, 438, 437, 3, 2, 2, 2, 438, 439, 3, 2, 2, 2, 439, 101, 3, 2, 2, 2, 440, 441, 7, 44, 2, 2, 441, 442, 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\ No newline at end of file
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2, 2, 2, 439, 99, 3, 2, 2, 2, 440, 442, 5, 98, 50, 2, 441, 443, 7, 42, 2, 2, 442, 441, 3, 2, 2, 2, 442, 443, 3, 2, 2, 2, 443, 101, 3, 2, 2, 2, 444, 445, 7, 44, 2, 2, 445, 446, 7, 45, 2, 2, 446, 103, 3, 2, 2, 2, 447, 448, 5, 106, 54, 2, 448, 449, 7, 40, 2, 2, 449, 450, 5, 106, 54, 2, 450, 105, 3, 2, 2, 2, 451, 454, 7, 44, 2, 2, 452, 454, 5, 102, 52, 2, 453, 451, 3, 2, 2, 2, 453, 452, 3, 2, 2, 2, 454, 107, 3, 2, 2, 2, 455, 456, 9, 7, 2, 2, 456, 109, 3, 2, 2, 2, 457, 458, 9, 8, 2, 2, 458, 111, 3, 2, 2, 2, 46, 115, 125, 137, 142, 150, 156, 163, 173, 180, 186, 191, 198, 204, 211, 217, 223, 230, 236, 242, 274, 280, 285, 292, 307, 318, 323, 331, 336, 344, 348, 352, 356, 362, 368, 373, 375, 388, 396, 405, 426, 433, 438, 442, 453]
\ No newline at end of file
diff --git a/src/import/generated/FSHParser.js b/src/import/generated/FSHParser.js
index aae5aa2..b7cb6bc 100644
--- a/src/import/generated/FSHParser.js
+++ b/src/import/generated/FSHParser.js
@@ -8,7 +8,7 @@ var grammarFileName = "FSH.g4";
 
 
 var serializedATN = ["\u0003\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964",
-    "\u0003;\u01c8\u0004\u0002\t\u0002\u0004\u0003\t\u0003\u0004\u0004\t",
+    "\u0003;\u01cc\u0004\u0002\t\u0002\u0004\u0003\t\u0003\u0004\u0004\t",
     "\u0004\u0004\u0005\t\u0005\u0004\u0006\t\u0006\u0004\u0007\t\u0007\u0004",
     "\b\t\b\u0004\t\t\t\u0004\n\t\n\u0004\u000b\t\u000b\u0004\f\t\f\u0004",
     "\r\t\r\u0004\u000e\t\u000e\u0004\u000f\t\u000f\u0004\u0010\t\u0010\u0004",
@@ -35,267 +35,270 @@ var serializedATN = ["\u0003\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964",
     "\n\u0005\n\u00c0\n\n\u0003\u000b\u0003\u000b\u0003\u000b\u0006\u000b",
     "\u00c5\n\u000b\r\u000b\u000e\u000b\u00c6\u0003\f\u0003\f\u0003\f\u0003",
     "\f\u0005\f\u00cd\n\f\u0003\r\u0003\r\u0003\r\u0007\r\u00d2\n\r\f\r\u000e",
-    "\r\u00d5\u000b\r\u0003\r\u0006\r\u00d8\n\r\r\r\u000e\r\u00d9\u0003\u000e",
-    "\u0003\u000e\u0003\u000e\u0005\u000e\u00df\n\u000e\u0003\u000f\u0003",
-    "\u000f\u0003\u000f\u0007\u000f\u00e4\n\u000f\f\u000f\u000e\u000f\u00e7",
-    "\u000b\u000f\u0003\u000f\u0007\u000f\u00ea\n\u000f\f\u000f\u000e\u000f",
-    "\u00ed\u000b\u000f\u0003\u0010\u0003\u0010\u0003\u0010\u0005\u0010\u00f2",
-    "\n\u0010\u0003\u0011\u0003\u0011\u0003\u0011\u0003\u0012\u0003\u0012",
-    "\u0003\u0012\u0003\u0013\u0003\u0013\u0003\u0013\u0003\u0014\u0003\u0014",
-    "\u0003\u0014\u0003\u0015\u0003\u0015\u0003\u0015\u0003\u0016\u0003\u0016",
-    "\u0003\u0016\u0003\u0017\u0003\u0017\u0003\u0017\u0003\u0018\u0003\u0018",
-    "\u0003\u0018\u0003\u0019\u0003\u0019\u0003\u0019\u0003\u0019\u0007\u0019",
-    "\u0110\n\u0019\f\u0019\u000e\u0019\u0113\u000b\u0019\u0003\u001a\u0003",
-    "\u001a\u0003\u001a\u0005\u001a\u0118\n\u001a\u0003\u001a\u0006\u001a",
-    "\u011b\n\u001a\r\u001a\u000e\u001a\u011c\u0003\u001b\u0003\u001b\u0003",
-    "\u001b\u0003\u001b\u0003\u001b\u0005\u001b\u0124\n\u001b\u0003\u001c",
-    "\u0003\u001c\u0003\u001c\u0003\u001c\u0003\u001c\u0003\u001d\u0003\u001d",
-    "\u0003\u001d\u0003\u001d\u0003\u001d\u0003\u001d\u0007\u001d\u0131\n",
-    "\u001d\f\u001d\u000e\u001d\u0134\u000b\u001d\u0003\u001e\u0003\u001e",
-    "\u0003\u001e\u0003\u001e\u0003\u001e\u0003\u001e\u0007\u001e\u013c\n",
-    "\u001e\f\u001e\u000e\u001e\u013f\u000b\u001e\u0003\u001f\u0003\u001f",
-    "\u0005\u001f\u0143\n\u001f\u0003\u001f\u0003\u001f\u0003\u001f\u0003",
-    "\u001f\u0007\u001f\u0149\n\u001f\f\u001f\u000e\u001f\u014c\u000b\u001f",
-    "\u0003 \u0003 \u0005 \u0150\n \u0003 \u0003 \u0003 \u0003 \u0003!\u0003",
-    "!\u0005!\u0158\n!\u0003!\u0003!\u0005!\u015c\n!\u0003\"\u0003\"\u0005",
-    "\"\u0160\n\"\u0003\"\u0003\"\u0005\"\u0164\n\"\u0003#\u0003#\u0003#",
-    "\u0003#\u0005#\u016a\n#\u0003$\u0003$\u0003$\u0003$\u0005$\u0170\n$",
-    "\u0003$\u0003$\u0003$\u0005$\u0175\n$\u0005$\u0177\n$\u0003%\u0003%",
-    "\u0003%\u0003&\u0003&\u0003&\u0003\'\u0003\'\u0003\'\u0006\'\u0182\n",
-    "\'\r\'\u000e\'\u0183\u0003\'\u0003\'\u0003(\u0003(\u0003(\u0003(\u0003",
-    ")\u0003)\u0003*\u0003*\u0003*\u0003*\u0005*\u0192\n*\u0003+\u0003+\u0003",
-    ",\u0003,\u0003-\u0003-\u0003.\u0003.\u0003/\u0003/\u00030\u00030\u0003",
-    "0\u00030\u00030\u00030\u00030\u00030\u00030\u00050\u01a7\n0\u00031\u0003",
-    "1\u00031\u00071\u01ac\n1\f1\u000e1\u01af\u000b1\u00032\u00032\u0005",
-    "2\u01b3\n2\u00033\u00033\u00053\u01b7\n3\u00034\u00034\u00034\u0003",
-    "5\u00035\u00035\u00035\u00036\u00036\u00056\u01c2\n6\u00037\u00037\u0003",
-    "8\u00038\u00038\u0002\u00029\u0002\u0004\u0006\b\n\f\u000e\u0010\u0012",
-    "\u0014\u0016\u0018\u001a\u001c\u001e \"$&(*,.02468:<>@BDFHJLNPRTVXZ",
-    "\\^`bdfhjln\u0002\b\u0003\u0002*+\u0004\u0002&&88\u0003\u0002\u0012",
-    "\u0014\u0003\u0002\u0016\u0019\u0003\u0002\u001f \u0004\u00023388\u0002",
-    "\u01d5\u0002s\u0003\u0002\u0002\u0002\u0004}\u0003\u0002\u0002\u0002",
-    "\u0006\u007f\u0003\u0002\u0002\u0002\b\u0084\u0003\u0002\u0002\u0002",
-    "\n\u0091\u0003\u0002\u0002\u0002\f\u00a3\u0003\u0002\u0002\u0002\u000e",
-    "\u00ad\u0003\u0002\u0002\u0002\u0010\u00af\u0003\u0002\u0002\u0002\u0012",
-    "\u00bf\u0003\u0002\u0002\u0002\u0014\u00c1\u0003\u0002\u0002\u0002\u0016",
-    "\u00cc\u0003\u0002\u0002\u0002\u0018\u00ce\u0003\u0002\u0002\u0002\u001a",
-    "\u00de\u0003\u0002\u0002\u0002\u001c\u00e0\u0003\u0002\u0002\u0002\u001e",
-    "\u00f1\u0003\u0002\u0002\u0002 \u00f3\u0003\u0002\u0002\u0002\"\u00f6",
-    "\u0003\u0002\u0002\u0002$\u00f9\u0003\u0002\u0002\u0002&\u00fc\u0003",
-    "\u0002\u0002\u0002(\u00ff\u0003\u0002\u0002\u0002*\u0102\u0003\u0002",
-    "\u0002\u0002,\u0105\u0003\u0002\u0002\u0002.\u0108\u0003\u0002\u0002",
-    "\u00020\u010b\u0003\u0002\u0002\u00022\u0114\u0003\u0002\u0002\u0002",
-    "4\u011e\u0003\u0002\u0002\u00026\u0125\u0003\u0002\u0002\u00028\u012a",
-    "\u0003\u0002\u0002\u0002:\u0135\u0003\u0002\u0002\u0002<\u0140\u0003",
-    "\u0002\u0002\u0002>\u014d\u0003\u0002\u0002\u0002@\u0155\u0003\u0002",
-    "\u0002\u0002B\u0163\u0003\u0002\u0002\u0002D\u0165\u0003\u0002\u0002",
-    "\u0002F\u016b\u0003\u0002\u0002\u0002H\u0178\u0003\u0002\u0002\u0002",
-    "J\u017b\u0003\u0002\u0002\u0002L\u0181\u0003\u0002\u0002\u0002N\u0187",
-    "\u0003\u0002\u0002\u0002P\u018b\u0003\u0002\u0002\u0002R\u0191\u0003",
-    "\u0002\u0002\u0002T\u0193\u0003\u0002\u0002\u0002V\u0195\u0003\u0002",
-    "\u0002\u0002X\u0197\u0003\u0002\u0002\u0002Z\u0199\u0003\u0002\u0002",
-    "\u0002\\\u019b\u0003\u0002\u0002\u0002^\u01a6\u0003\u0002\u0002\u0002",
-    "`\u01a8\u0003\u0002\u0002\u0002b\u01b0\u0003\u0002\u0002\u0002d\u01b4",
-    "\u0003\u0002\u0002\u0002f\u01b8\u0003\u0002\u0002\u0002h\u01bb\u0003",
-    "\u0002\u0002\u0002j\u01c1\u0003\u0002\u0002\u0002l\u01c3\u0003\u0002",
-    "\u0002\u0002n\u01c5\u0003\u0002\u0002\u0002pr\u0005\u0004\u0003\u0002",
-    "qp\u0003\u0002\u0002\u0002ru\u0003\u0002\u0002\u0002sq\u0003\u0002\u0002",
-    "\u0002st\u0003\u0002\u0002\u0002t\u0003\u0003\u0002\u0002\u0002us\u0003",
-    "\u0002\u0002\u0002v~\u0005\u0006\u0004\u0002w~\u0005\b\u0005\u0002x",
-    "~\u0005\n\u0006\u0002y~\u0005\u0014\u000b\u0002z~\u0005\u0010\t\u0002",
-    "{~\u0005\u0018\r\u0002|~\u0005\u001c\u000f\u0002}v\u0003\u0002\u0002",
-    "\u0002}w\u0003\u0002\u0002\u0002}x\u0003\u0002\u0002\u0002}y\u0003\u0002",
-    "\u0002\u0002}z\u0003\u0002\u0002\u0002}{\u0003\u0002\u0002\u0002}|\u0003",
-    "\u0002\u0002\u0002~\u0005\u0003\u0002\u0002\u0002\u007f\u0080\u0007",
-    "\u0003\u0002\u0002\u0080\u0081\u00078\u0002\u0002\u0081\u0082\u0007",
-    "&\u0002\u0002\u0082\u0083\u00078\u0002\u0002\u0083\u0007\u0003\u0002",
-    "\u0002\u0002\u0084\u0085\u0007\u0004\u0002\u0002\u0085\u0087\u00078",
-    "\u0002\u0002\u0086\u0088\u0005\f\u0007\u0002\u0087\u0086\u0003\u0002",
-    "\u0002\u0002\u0088\u0089\u0003\u0002\u0002\u0002\u0089\u0087\u0003\u0002",
-    "\u0002\u0002\u0089\u008a\u0003\u0002\u0002\u0002\u008a\u008e\u0003\u0002",
-    "\u0002\u0002\u008b\u008d\u0005\u000e\b\u0002\u008c\u008b\u0003\u0002",
-    "\u0002\u0002\u008d\u0090\u0003\u0002\u0002\u0002\u008e\u008c\u0003\u0002",
-    "\u0002\u0002\u008e\u008f\u0003\u0002\u0002\u0002\u008f\t\u0003\u0002",
-    "\u0002\u0002\u0090\u008e\u0003\u0002\u0002\u0002\u0091\u0092\u0007\u0005",
-    "\u0002\u0002\u0092\u0096\u00078\u0002\u0002\u0093\u0095\u0005\f\u0007",
-    "\u0002\u0094\u0093\u0003\u0002\u0002\u0002\u0095\u0098\u0003\u0002\u0002",
-    "\u0002\u0096\u0094\u0003\u0002\u0002\u0002\u0096\u0097\u0003\u0002\u0002",
-    "\u0002\u0097\u009c\u0003\u0002\u0002\u0002\u0098\u0096\u0003\u0002\u0002",
-    "\u0002\u0099\u009b\u0005\u000e\b\u0002\u009a\u0099\u0003\u0002\u0002",
-    "\u0002\u009b\u009e\u0003\u0002\u0002\u0002\u009c\u009a\u0003\u0002\u0002",
-    "\u0002\u009c\u009d\u0003\u0002\u0002\u0002\u009d\u000b\u0003\u0002\u0002",
-    "\u0002\u009e\u009c\u0003\u0002\u0002\u0002\u009f\u00a4\u0005 \u0011",
-    "\u0002\u00a0\u00a4\u0005\"\u0012\u0002\u00a1\u00a4\u0005$\u0013\u0002",
-    "\u00a2\u00a4\u0005&\u0014\u0002\u00a3\u009f\u0003\u0002\u0002\u0002",
-    "\u00a3\u00a0\u0003\u0002\u0002\u0002\u00a3\u00a1\u0003\u0002\u0002\u0002",
-    "\u00a3\u00a2\u0003\u0002\u0002\u0002\u00a4\r\u0003\u0002\u0002\u0002",
-    "\u00a5\u00ae\u00050\u0019\u0002\u00a6\u00ae\u00052\u001a\u0002\u00a7",
-    "\u00ae\u00054\u001b\u0002\u00a8\u00ae\u00056\u001c\u0002\u00a9\u00ae",
-    "\u00058\u001d\u0002\u00aa\u00ae\u0005:\u001e\u0002\u00ab\u00ae\u0005",
-    "<\u001f\u0002\u00ac\u00ae\u0005> \u0002\u00ad\u00a5\u0003\u0002\u0002",
-    "\u0002\u00ad\u00a6\u0003\u0002\u0002\u0002\u00ad\u00a7\u0003\u0002\u0002",
-    "\u0002\u00ad\u00a8\u0003\u0002\u0002\u0002\u00ad\u00a9\u0003\u0002\u0002",
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-    "\u0002\u00af\u00b0\u0007\u0006\u0002\u0002\u00b0\u00b4\u00078\u0002",
-    "\u0002\u00b1\u00b3\u0005\u0012\n\u0002\u00b2\u00b1\u0003\u0002\u0002",
-    "\u0002\u00b3\u00b6\u0003\u0002\u0002\u0002\u00b4\u00b2\u0003\u0002\u0002",
-    "\u0002\u00b4\u00b5\u0003\u0002\u0002\u0002\u00b5\u00ba\u0003\u0002\u0002",
-    "\u0002\u00b6\u00b4\u0003\u0002\u0002\u0002\u00b7\u00b9\u00056\u001c",
-    "\u0002\u00b8\u00b7\u0003\u0002\u0002\u0002\u00b9\u00bc\u0003\u0002\u0002",
-    "\u0002\u00ba\u00b8\u0003\u0002\u0002\u0002\u00ba\u00bb\u0003\u0002\u0002",
-    "\u0002\u00bb\u0011\u0003\u0002\u0002\u0002\u00bc\u00ba\u0003\u0002\u0002",
-    "\u0002\u00bd\u00c0\u0005.\u0018\u0002\u00be\u00c0\u0005$\u0013\u0002",
-    "\u00bf\u00bd\u0003\u0002\u0002\u0002\u00bf\u00be\u0003\u0002\u0002\u0002",
-    "\u00c0\u0013\u0003\u0002\u0002\u0002\u00c1\u00c2\u0007\b\u0002\u0002",
-    "\u00c2\u00c4\u00078\u0002\u0002\u00c3\u00c5\u0005\u0016\f\u0002\u00c4",
-    "\u00c3\u0003\u0002\u0002\u0002\u00c5\u00c6\u0003\u0002\u0002\u0002\u00c6",
-    "\u00c4\u0003\u0002\u0002\u0002\u00c6\u00c7\u0003\u0002\u0002\u0002\u00c7",
-    "\u0015\u0003\u0002\u0002\u0002\u00c8\u00cd\u0005&\u0014\u0002\u00c9",
-    "\u00cd\u0005(\u0015\u0002\u00ca\u00cd\u0005*\u0016\u0002\u00cb\u00cd",
-    "\u0005,\u0017\u0002\u00cc\u00c8\u0003\u0002\u0002\u0002\u00cc\u00c9",
-    "\u0003\u0002\u0002\u0002\u00cc\u00ca\u0003\u0002\u0002\u0002\u00cc\u00cb",
-    "\u0003\u0002\u0002\u0002\u00cd\u0017\u0003\u0002\u0002\u0002\u00ce\u00cf",
-    "\u0007\t\u0002\u0002\u00cf\u00d3\u00078\u0002\u0002\u00d0\u00d2\u0005",
-    "\u001a\u000e\u0002\u00d1\u00d0\u0003\u0002\u0002\u0002\u00d2\u00d5\u0003",
-    "\u0002\u0002\u0002\u00d3\u00d1\u0003\u0002\u0002\u0002\u00d3\u00d4\u0003",
-    "\u0002\u0002\u0002\u00d4\u00d7\u0003\u0002\u0002\u0002\u00d5\u00d3\u0003",
-    "\u0002\u0002\u0002\u00d6\u00d8\u0005@!\u0002\u00d7\u00d6\u0003\u0002",
-    "\u0002\u0002\u00d8\u00d9\u0003\u0002\u0002\u0002\u00d9\u00d7\u0003\u0002",
-    "\u0002\u0002\u00d9\u00da\u0003\u0002\u0002\u0002\u00da\u0019\u0003\u0002",
-    "\u0002\u0002\u00db\u00df\u0005\"\u0012\u0002\u00dc\u00df\u0005$\u0013",
-    "\u0002\u00dd\u00df\u0005&\u0014\u0002\u00de\u00db\u0003\u0002\u0002",
-    "\u0002\u00de\u00dc\u0003\u0002\u0002\u0002\u00de\u00dd\u0003\u0002\u0002",
-    "\u0002\u00df\u001b\u0003\u0002\u0002\u0002\u00e0\u00e1\u0007\n\u0002",
-    "\u0002\u00e1\u00e5\u00078\u0002\u0002\u00e2\u00e4\u0005\u001e\u0010",
-    "\u0002\u00e3\u00e2\u0003\u0002\u0002\u0002\u00e4\u00e7\u0003\u0002\u0002",
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+    "H\u0179\u0003\u0002\u0002\u0002J\u017c\u0003\u0002\u0002\u0002L\u0184",
+    "\u0003\u0002\u0002\u0002N\u0189\u0003\u0002\u0002\u0002P\u018e\u0003",
+    "\u0002\u0002\u0002R\u0195\u0003\u0002\u0002\u0002T\u0197\u0003\u0002",
+    "\u0002\u0002V\u0199\u0003\u0002\u0002\u0002X\u019b\u0003\u0002\u0002",
+    "\u0002Z\u019d\u0003\u0002\u0002\u0002\\\u019f\u0003\u0002\u0002\u0002",
+    "^\u01aa\u0003\u0002\u0002\u0002`\u01ac\u0003\u0002\u0002\u0002b\u01b4",
+    "\u0003\u0002\u0002\u0002d\u01b8\u0003\u0002\u0002\u0002f\u01bc\u0003",
+    "\u0002\u0002\u0002h\u01bf\u0003\u0002\u0002\u0002j\u01c5\u0003\u0002",
+    "\u0002\u0002l\u01c7\u0003\u0002\u0002\u0002n\u01c9\u0003\u0002\u0002",
+    "\u0002pr\u0005\u0004\u0003\u0002qp\u0003\u0002\u0002\u0002ru\u0003\u0002",
+    "\u0002\u0002sq\u0003\u0002\u0002\u0002st\u0003\u0002\u0002\u0002t\u0003",
+    "\u0003\u0002\u0002\u0002us\u0003\u0002\u0002\u0002v~\u0005\u0006\u0004",
+    "\u0002w~\u0005\b\u0005\u0002x~\u0005\n\u0006\u0002y~\u0005\u0014\u000b",
+    "\u0002z~\u0005\u0010\t\u0002{~\u0005\u0018\r\u0002|~\u0005\u001c\u000f",
+    "\u0002}v\u0003\u0002\u0002\u0002}w\u0003\u0002\u0002\u0002}x\u0003\u0002",
+    "\u0002\u0002}y\u0003\u0002\u0002\u0002}z\u0003\u0002\u0002\u0002}{\u0003",
+    "\u0002\u0002\u0002}|\u0003\u0002\u0002\u0002~\u0005\u0003\u0002\u0002",
+    "\u0002\u007f\u0080\u0007\u0003\u0002\u0002\u0080\u0081\u00078\u0002",
+    "\u0002\u0081\u0082\u0007&\u0002\u0002\u0082\u0083\u00078\u0002\u0002",
+    "\u0083\u0007\u0003\u0002\u0002\u0002\u0084\u0085\u0007\u0004\u0002\u0002",
+    "\u0085\u0087\u00078\u0002\u0002\u0086\u0088\u0005\f\u0007\u0002\u0087",
+    "\u0086\u0003\u0002\u0002\u0002\u0088\u0089\u0003\u0002\u0002\u0002\u0089",
+    "\u0087\u0003\u0002\u0002\u0002\u0089\u008a\u0003\u0002\u0002\u0002\u008a",
+    "\u008e\u0003\u0002\u0002\u0002\u008b\u008d\u0005\u000e\b\u0002\u008c",
+    "\u008b\u0003\u0002\u0002\u0002\u008d\u0090\u0003\u0002\u0002\u0002\u008e",
+    "\u008c\u0003\u0002\u0002\u0002\u008e\u008f\u0003\u0002\u0002\u0002\u008f",
+    "\t\u0003\u0002\u0002\u0002\u0090\u008e\u0003\u0002\u0002\u0002\u0091",
+    "\u0092\u0007\u0005\u0002\u0002\u0092\u0096\u00078\u0002\u0002\u0093",
+    "\u0095\u0005\f\u0007\u0002\u0094\u0093\u0003\u0002\u0002\u0002\u0095",
+    "\u0098\u0003\u0002\u0002\u0002\u0096\u0094\u0003\u0002\u0002\u0002\u0096",
+    "\u0097\u0003\u0002\u0002\u0002\u0097\u009c\u0003\u0002\u0002\u0002\u0098",
+    "\u0096\u0003\u0002\u0002\u0002\u0099\u009b\u0005\u000e\b\u0002\u009a",
+    "\u0099\u0003\u0002\u0002\u0002\u009b\u009e\u0003\u0002\u0002\u0002\u009c",
+    "\u009a\u0003\u0002\u0002\u0002\u009c\u009d\u0003\u0002\u0002\u0002\u009d",
+    "\u000b\u0003\u0002\u0002\u0002\u009e\u009c\u0003\u0002\u0002\u0002\u009f",
+    "\u00a4\u0005 \u0011\u0002\u00a0\u00a4\u0005\"\u0012\u0002\u00a1\u00a4",
+    "\u0005$\u0013\u0002\u00a2\u00a4\u0005&\u0014\u0002\u00a3\u009f\u0003",
+    "\u0002\u0002\u0002\u00a3\u00a0\u0003\u0002\u0002\u0002\u00a3\u00a1\u0003",
+    "\u0002\u0002\u0002\u00a3\u00a2\u0003\u0002\u0002\u0002\u00a4\r\u0003",
+    "\u0002\u0002\u0002\u00a5\u00ae\u00050\u0019\u0002\u00a6\u00ae\u0005",
+    "2\u001a\u0002\u00a7\u00ae\u00054\u001b\u0002\u00a8\u00ae\u00056\u001c",
+    "\u0002\u00a9\u00ae\u00058\u001d\u0002\u00aa\u00ae\u0005:\u001e\u0002",
+    "\u00ab\u00ae\u0005<\u001f\u0002\u00ac\u00ae\u0005> \u0002\u00ad\u00a5",
+    "\u0003\u0002\u0002\u0002\u00ad\u00a6\u0003\u0002\u0002\u0002\u00ad\u00a7",
+    "\u0003\u0002\u0002\u0002\u00ad\u00a8\u0003\u0002\u0002\u0002\u00ad\u00a9",
+    "\u0003\u0002\u0002\u0002\u00ad\u00aa\u0003\u0002\u0002\u0002\u00ad\u00ab",
+    "\u0003\u0002\u0002\u0002\u00ad\u00ac\u0003\u0002\u0002\u0002\u00ae\u000f",
+    "\u0003\u0002\u0002\u0002\u00af\u00b0\u0007\u0006\u0002\u0002\u00b0\u00b4",
+    "\u00078\u0002\u0002\u00b1\u00b3\u0005\u0012\n\u0002\u00b2\u00b1\u0003",
+    "\u0002\u0002\u0002\u00b3\u00b6\u0003\u0002\u0002\u0002\u00b4\u00b2\u0003",
+    "\u0002\u0002\u0002\u00b4\u00b5\u0003\u0002\u0002\u0002\u00b5\u00ba\u0003",
+    "\u0002\u0002\u0002\u00b6\u00b4\u0003\u0002\u0002\u0002\u00b7\u00b9\u0005",
+    "6\u001c\u0002\u00b8\u00b7\u0003\u0002\u0002\u0002\u00b9\u00bc\u0003",
+    "\u0002\u0002\u0002\u00ba\u00b8\u0003\u0002\u0002\u0002\u00ba\u00bb\u0003",
+    "\u0002\u0002\u0002\u00bb\u0011\u0003\u0002\u0002\u0002\u00bc\u00ba\u0003",
+    "\u0002\u0002\u0002\u00bd\u00c0\u0005.\u0018\u0002\u00be\u00c0\u0005",
+    "$\u0013\u0002\u00bf\u00bd\u0003\u0002\u0002\u0002\u00bf\u00be\u0003",
+    "\u0002\u0002\u0002\u00c0\u0013\u0003\u0002\u0002\u0002\u00c1\u00c2\u0007",
+    "\b\u0002\u0002\u00c2\u00c4\u00078\u0002\u0002\u00c3\u00c5\u0005\u0016",
+    "\f\u0002\u00c4\u00c3\u0003\u0002\u0002\u0002\u00c5\u00c6\u0003\u0002",
+    "\u0002\u0002\u00c6\u00c4\u0003\u0002\u0002\u0002\u00c6\u00c7\u0003\u0002",
+    "\u0002\u0002\u00c7\u0015\u0003\u0002\u0002\u0002\u00c8\u00cd\u0005&",
+    "\u0014\u0002\u00c9\u00cd\u0005(\u0015\u0002\u00ca\u00cd\u0005*\u0016",
+    "\u0002\u00cb\u00cd\u0005,\u0017\u0002\u00cc\u00c8\u0003\u0002\u0002",
+    "\u0002\u00cc\u00c9\u0003\u0002\u0002\u0002\u00cc\u00ca\u0003\u0002\u0002",
+    "\u0002\u00cc\u00cb\u0003\u0002\u0002\u0002\u00cd\u0017\u0003\u0002\u0002",
+    "\u0002\u00ce\u00cf\u0007\t\u0002\u0002\u00cf\u00d3\u00078\u0002\u0002",
+    "\u00d0\u00d2\u0005\u001a\u000e\u0002\u00d1\u00d0\u0003\u0002\u0002\u0002",
+    "\u00d2\u00d5\u0003\u0002\u0002\u0002\u00d3\u00d1\u0003\u0002\u0002\u0002",
+    "\u00d3\u00d4\u0003\u0002\u0002\u0002\u00d4\u00d9\u0003\u0002\u0002\u0002",
+    "\u00d5\u00d3\u0003\u0002\u0002\u0002\u00d6\u00d8\u0005@!\u0002\u00d7",
+    "\u00d6\u0003\u0002\u0002\u0002\u00d8\u00db\u0003\u0002\u0002\u0002\u00d9",
+    "\u00d7\u0003\u0002\u0002\u0002\u00d9\u00da\u0003\u0002\u0002\u0002\u00da",
+    "\u0019\u0003\u0002\u0002\u0002\u00db\u00d9\u0003\u0002\u0002\u0002\u00dc",
+    "\u00e0\u0005\"\u0012\u0002\u00dd\u00e0\u0005$\u0013\u0002\u00de\u00e0",
+    "\u0005&\u0014\u0002\u00df\u00dc\u0003\u0002\u0002\u0002\u00df\u00dd",
+    "\u0003\u0002\u0002\u0002\u00df\u00de\u0003\u0002\u0002\u0002\u00e0\u001b",
+    "\u0003\u0002\u0002\u0002\u00e1\u00e2\u0007\n\u0002\u0002\u00e2\u00e6",
+    "\u00078\u0002\u0002\u00e3\u00e5\u0005\u001e\u0010\u0002\u00e4\u00e3",
+    "\u0003\u0002\u0002\u0002\u00e5\u00e8\u0003\u0002\u0002\u0002\u00e6\u00e4",
+    "\u0003\u0002\u0002\u0002\u00e6\u00e7\u0003\u0002\u0002\u0002\u00e7\u00ec",
+    "\u0003\u0002\u0002\u0002\u00e8\u00e6\u0003\u0002\u0002\u0002\u00e9\u00eb",
+    "\u0005d3\u0002\u00ea\u00e9\u0003\u0002\u0002\u0002\u00eb\u00ee\u0003",
+    "\u0002\u0002\u0002\u00ec\u00ea\u0003\u0002\u0002\u0002\u00ec\u00ed\u0003",
+    "\u0002\u0002\u0002\u00ed\u001d\u0003\u0002\u0002\u0002\u00ee\u00ec\u0003",
+    "\u0002\u0002\u0002\u00ef\u00f3\u0005\"\u0012\u0002\u00f0\u00f3\u0005",
+    "$\u0013\u0002\u00f1\u00f3\u0005&\u0014\u0002\u00f2\u00ef\u0003\u0002",
+    "\u0002\u0002\u00f2\u00f0\u0003\u0002\u0002\u0002\u00f2\u00f1\u0003\u0002",
+    "\u0002\u0002\u00f3\u001f\u0003\u0002\u0002\u0002\u00f4\u00f5\u0007\u000b",
+    "\u0002\u0002\u00f5\u00f6\u00078\u0002\u0002\u00f6!\u0003\u0002\u0002",
+    "\u0002\u00f7\u00f8\u0007\f\u0002\u0002\u00f8\u00f9\u00078\u0002\u0002",
+    "\u00f9#\u0003\u0002\u0002\u0002\u00fa\u00fb\u0007\r\u0002\u0002\u00fb",
+    "\u00fc\u0007*\u0002\u0002\u00fc%\u0003\u0002\u0002\u0002\u00fd\u00fe",
+    "\u0007\u000e\u0002\u0002\u00fe\u00ff\t\u0002\u0002\u0002\u00ff\'\u0003",
+    "\u0002\u0002\u0002\u0100\u0101\u0007\u000f\u0002\u0002\u0101\u0102\u0007",
+    "*\u0002\u0002\u0102)\u0003\u0002\u0002\u0002\u0103\u0104\u0007\u0010",
+    "\u0002\u0002\u0104\u0105\u0007*\u0002\u0002\u0105+\u0003\u0002\u0002",
+    "\u0002\u0106\u0107\u0007\u0011\u0002\u0002\u0107\u0108\u0007.\u0002",
+    "\u0002\u0108-\u0003\u0002\u0002\u0002\u0109\u010a\u0007\u0007\u0002",
+    "\u0002\u010a\u010b\u00078\u0002\u0002\u010b/\u0003\u0002\u0002\u0002",
+    "\u010c\u010d\u0007\'\u0002\u0002\u010d\u010e\u0005T+\u0002\u010e\u0112",
+    "\u00072\u0002\u0002\u010f\u0111\u0005Z.\u0002\u0110\u010f\u0003\u0002",
+    "\u0002\u0002\u0111\u0114\u0003\u0002\u0002\u0002\u0112\u0110\u0003\u0002",
+    "\u0002\u0002\u0112\u0113\u0003\u0002\u0002\u0002\u01131\u0003\u0002",
+    "\u0002\u0002\u0114\u0112\u0003\u0002\u0002\u0002\u0115\u0118\u0007\'",
+    "\u0002\u0002\u0116\u0119\u0005T+\u0002\u0117\u0119\u0005V,\u0002\u0118",
+    "\u0116\u0003\u0002\u0002\u0002\u0118\u0117\u0003\u0002\u0002\u0002\u0119",
+    "\u011b\u0003\u0002\u0002\u0002\u011a\u011c\u0005Z.\u0002\u011b\u011a",
+    "\u0003\u0002\u0002\u0002\u011c\u011d\u0003\u0002\u0002\u0002\u011d\u011b",
+    "\u0003\u0002\u0002\u0002\u011d\u011e\u0003\u0002\u0002\u0002\u011e3",
+    "\u0003\u0002\u0002\u0002\u011f\u0120\u0007\'\u0002\u0002\u0120\u0121",
+    "\u0005T+\u0002\u0121\u0122\u0007\u0015\u0002\u0002\u0122\u0124\u0007",
+    "8\u0002\u0002\u0123\u0125\u0005\\/\u0002\u0124\u0123\u0003\u0002\u0002",
+    "\u0002\u0124\u0125\u0003\u0002\u0002\u0002\u01255\u0003\u0002\u0002",
+    "\u0002\u0126\u0127\u0007\'\u0002\u0002\u0127\u0128\u0005T+\u0002\u0128",
+    "\u0129\u0007&\u0002\u0002\u0129\u012a\u0005^0\u0002\u012a7\u0003\u0002",
+    "\u0002\u0002\u012b\u012c\u0007\'\u0002\u0002\u012c\u012d\u0005T+\u0002",
+    "\u012d\u012e\u0007\u001a\u0002\u0002\u012e\u0133\u0005`1\u0002\u012f",
+    "\u0130\u0007\u001b\u0002\u0002\u0130\u0132\u0005`1\u0002\u0131\u012f",
+    "\u0003\u0002\u0002\u0002\u0132\u0135\u0003\u0002\u0002\u0002\u0133\u0131",
+    "\u0003\u0002\u0002\u0002\u0133\u0134\u0003\u0002\u0002\u0002\u01349",
+    "\u0003\u0002\u0002\u0002\u0135\u0133\u0003\u0002\u0002\u0002\u0136\u0137",
+    "\u0007\'\u0002\u0002\u0137\u0138\u0005T+\u0002\u0138\u0139\u0007\u001c",
+    "\u0002\u0002\u0139\u013e\u0005n8\u0002\u013a\u013b\u0007\u001d\u0002",
+    "\u0002\u013b\u013d\u0005n8\u0002\u013c\u013a\u0003\u0002\u0002\u0002",
+    "\u013d\u0140\u0003\u0002\u0002\u0002\u013e\u013c\u0003\u0002\u0002\u0002",
+    "\u013e\u013f\u0003\u0002\u0002\u0002\u013f;\u0003\u0002\u0002\u0002",
+    "\u0140\u013e\u0003\u0002\u0002\u0002\u0141\u0143\u0007\'\u0002\u0002",
+    "\u0142\u0144\u0005T+\u0002\u0143\u0142\u0003\u0002\u0002\u0002\u0143",
+    "\u0144\u0003\u0002\u0002\u0002\u0144\u0145\u0003\u0002\u0002\u0002\u0145",
+    "\u0146\u0007\u001e\u0002\u0002\u0146\u014b\u00078\u0002\u0002\u0147",
+    "\u0148\u0007\u001b\u0002\u0002\u0148\u014a\u00078\u0002\u0002\u0149",
+    "\u0147\u0003\u0002\u0002\u0002\u014a\u014d\u0003\u0002\u0002\u0002\u014b",
+    "\u0149\u0003\u0002\u0002\u0002\u014b\u014c\u0003\u0002\u0002\u0002\u014c",
+    "=\u0003\u0002\u0002\u0002\u014d\u014b\u0003\u0002\u0002\u0002\u014e",
+    "\u0150\u0007\'\u0002\u0002\u014f\u0151\u0005T+\u0002\u0150\u014f\u0003",
+    "\u0002\u0002\u0002\u0150\u0151\u0003\u0002\u0002\u0002\u0151\u0152\u0003",
+    "\u0002\u0002\u0002\u0152\u0153\u0005X-\u0002\u0153\u0154\u0007&\u0002",
+    "\u0002\u0154\u0155\u0005^0\u0002\u0155?\u0003\u0002\u0002\u0002\u0156",
+    "\u0158\u0007\'\u0002\u0002\u0157\u0159\u0007!\u0002\u0002\u0158\u0157",
+    "\u0003\u0002\u0002\u0002\u0158\u0159\u0003\u0002\u0002\u0002\u0159\u015c",
+    "\u0003\u0002\u0002\u0002\u015a\u015d\u0005B\"\u0002\u015b\u015d\u0005",
+    "D#\u0002\u015c\u015a\u0003\u0002\u0002\u0002\u015c\u015b\u0003\u0002",
+    "\u0002\u0002\u015dA\u0003\u0002\u0002\u0002\u015e\u0160\u0005b2\u0002",
+    "\u015f\u0161\u0005F$\u0002\u0160\u015f\u0003\u0002\u0002\u0002\u0160",
+    "\u0161\u0003\u0002\u0002\u0002\u0161\u0165\u0003\u0002\u0002\u0002\u0162",
+    "\u0163\u00076\u0002\u0002\u0163\u0165\u0005F$\u0002\u0164\u015e\u0003",
+    "\u0002\u0002\u0002\u0164\u0162\u0003\u0002\u0002\u0002\u0165C\u0003",
+    "\u0002\u0002\u0002\u0166\u0167\u0007\"\u0002\u0002\u0167\u016a\u0005",
+    "F$\u0002\u0168\u0169\u0007#\u0002\u0002\u0169\u016b\u0005L\'\u0002\u016a",
+    "\u0168\u0003\u0002\u0002\u0002\u016a\u016b\u0003\u0002\u0002\u0002\u016b",
+    "E\u0003\u0002\u0002\u0002\u016c\u0177\u0007\u0015\u0002\u0002\u016d",
+    "\u0170\u0005H%\u0002\u016e\u016f\u0007\u001b\u0002\u0002\u016f\u0171",
+    "\u0005J&\u0002\u0170\u016e\u0003\u0002\u0002\u0002\u0170\u0171\u0003",
+    "\u0002\u0002\u0002\u0171\u0178\u0003\u0002\u0002\u0002\u0172\u0175\u0005",
+    "J&\u0002\u0173\u0174\u0007\u001b\u0002\u0002\u0174\u0176\u0005H%\u0002",
+    "\u0175\u0173\u0003\u0002\u0002\u0002\u0175\u0176\u0003\u0002\u0002\u0002",
+    "\u0176\u0178\u0003\u0002\u0002\u0002\u0177\u016d\u0003\u0002\u0002\u0002",
+    "\u0177\u0172\u0003\u0002\u0002\u0002\u0178G\u0003\u0002\u0002\u0002",
+    "\u0179\u017a\u0007%\u0002\u0002\u017a\u017b\u00078\u0002\u0002\u017b",
+    "I\u0003\u0002\u0002\u0002\u017c\u017d\u0007$\u0002\u0002\u017d\u017e",
+    "\t\u0003\u0002\u0002\u017eK\u0003\u0002\u0002\u0002\u017f\u0180\u0005",
+    "N(\u0002\u0180\u0181\u0007\u001b\u0002\u0002\u0181\u0183\u0003\u0002",
+    "\u0002\u0002\u0182\u017f\u0003\u0002\u0002\u0002\u0183\u0186\u0003\u0002",
+    "\u0002\u0002\u0184\u0182\u0003\u0002\u0002\u0002\u0184\u0185\u0003\u0002",
+    "\u0002\u0002\u0185\u0187\u0003\u0002\u0002\u0002\u0186\u0184\u0003\u0002",
+    "\u0002\u0002\u0187\u0188\u0005N(\u0002\u0188M\u0003\u0002\u0002\u0002",
+    "\u0189\u018a\u00078\u0002\u0002\u018a\u018c\u0005P)\u0002\u018b\u018d",
+    "\u0005R*\u0002\u018c\u018b\u0003\u0002\u0002\u0002\u018c\u018d\u0003",
+    "\u0002\u0002\u0002\u018dO\u0003\u0002\u0002\u0002\u018e\u018f\t\u0004",
+    "\u0002\u0002\u018fQ\u0003\u0002\u0002\u0002\u0190\u0196\u0005b2\u0002",
+    "\u0191\u0196\u0007\u001f\u0002\u0002\u0192\u0196\u0007 \u0002\u0002",
+    "\u0193\u0196\u00075\u0002\u0002\u0194\u0196\u0007*\u0002\u0002\u0195",
+    "\u0190\u0003\u0002\u0002\u0002\u0195\u0191\u0003\u0002\u0002\u0002\u0195",
+    "\u0192\u0003\u0002\u0002\u0002\u0195\u0193\u0003\u0002\u0002\u0002\u0195",
+    "\u0194\u0003\u0002\u0002\u0002\u0196S\u0003\u0002\u0002\u0002\u0197",
+    "\u0198\u00078\u0002\u0002\u0198U\u0003\u0002\u0002\u0002\u0199\u019a",
+    "\u00077\u0002\u0002\u019aW\u0003\u0002\u0002\u0002\u019b\u019c\u0007",
+    "4\u0002\u0002\u019cY\u0003\u0002\u0002\u0002\u019d\u019e\t\u0005\u0002",
+    "\u0002\u019e[\u0003\u0002\u0002\u0002\u019f\u01a0\t\u0006\u0002\u0002",
+    "\u01a0]\u0003\u0002\u0002\u0002\u01a1\u01ab\u0007*\u0002\u0002\u01a2",
+    "\u01ab\u0007+\u0002\u0002\u01a3\u01ab\u0007,\u0002\u0002\u01a4\u01ab",
+    "\u00070\u0002\u0002\u01a5\u01ab\u00071\u0002\u0002\u01a6\u01ab\u0005",
+    "b2\u0002\u01a7\u01ab\u0005f4\u0002\u01a8\u01ab\u0005h5\u0002\u01a9\u01ab",
+    "\u0005l7\u0002\u01aa\u01a1\u0003\u0002\u0002\u0002\u01aa\u01a2\u0003",
+    "\u0002\u0002\u0002\u01aa\u01a3\u0003\u0002\u0002\u0002\u01aa\u01a4\u0003",
+    "\u0002\u0002\u0002\u01aa\u01a5\u0003\u0002\u0002\u0002\u01aa\u01a6\u0003",
+    "\u0002\u0002\u0002\u01aa\u01a7\u0003\u0002\u0002\u0002\u01aa\u01a8\u0003",
+    "\u0002\u0002\u0002\u01aa\u01a9\u0003\u0002\u0002\u0002\u01ab_\u0003",
+    "\u0002\u0002\u0002\u01ac\u01ad\u00078\u0002\u0002\u01ad\u01b1\u0007",
+    "2\u0002\u0002\u01ae\u01b0\u0005Z.\u0002\u01af\u01ae\u0003\u0002\u0002",
+    "\u0002\u01b0\u01b3\u0003\u0002\u0002\u0002\u01b1\u01af\u0003\u0002\u0002",
+    "\u0002\u01b1\u01b2\u0003\u0002\u0002\u0002\u01b2a\u0003\u0002\u0002",
+    "\u0002\u01b3\u01b1\u0003\u0002\u0002\u0002\u01b4\u01b6\u0007.\u0002",
+    "\u0002\u01b5\u01b7\u0007*\u0002\u0002\u01b6\u01b5\u0003\u0002\u0002",
+    "\u0002\u01b6\u01b7\u0003\u0002\u0002\u0002\u01b7c\u0003\u0002\u0002",
+    "\u0002\u01b8\u01ba\u0005b2\u0002\u01b9\u01bb\u0007*\u0002\u0002\u01ba",
+    "\u01b9\u0003\u0002\u0002\u0002\u01ba\u01bb\u0003\u0002\u0002\u0002\u01bb",
+    "e\u0003\u0002\u0002\u0002\u01bc\u01bd\u0007,\u0002\u0002\u01bd\u01be",
+    "\u0007-\u0002\u0002\u01beg\u0003\u0002\u0002\u0002\u01bf\u01c0\u0005",
+    "j6\u0002\u01c0\u01c1\u0007(\u0002\u0002\u01c1\u01c2\u0005j6\u0002\u01c2",
+    "i\u0003\u0002\u0002\u0002\u01c3\u01c6\u0007,\u0002\u0002\u01c4\u01c6",
+    "\u0005f4\u0002\u01c5\u01c3\u0003\u0002\u0002\u0002\u01c5\u01c4\u0003",
+    "\u0002\u0002\u0002\u01c6k\u0003\u0002\u0002\u0002\u01c7\u01c8\t\u0007",
+    "\u0002\u0002\u01c8m\u0003\u0002\u0002\u0002\u01c9\u01ca\t\b\u0002\u0002",
+    "\u01cao\u0003\u0002\u0002\u0002.s}\u0089\u008e\u0096\u009c\u00a3\u00ad",
+    "\u00b4\u00ba\u00bf\u00c6\u00cc\u00d3\u00d9\u00df\u00e6\u00ec\u00f2\u0112",
+    "\u0118\u011d\u0124\u0133\u013e\u0143\u014b\u0150\u0158\u015c\u0160\u0164",
+    "\u016a\u0170\u0175\u0177\u0184\u018c\u0195\u01aa\u01b1\u01b6\u01ba\u01c5"].join("");
 
 
 var atn = new antlr4.atn.ATNDeserializer().deserialize(serializedATN);
@@ -1753,16 +1756,16 @@ FSHParser.prototype.valueSet = function() {
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
-        this.state = 213; 
+        this.state = 215;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
-        do {
+        while(_la===FSHParser.STAR) {
             this.state = 212;
             this.vsComponent();
-            this.state = 215; 
+            this.state = 217;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
-        } while(_la===FSHParser.STAR);
+        }
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
 	        localctx.exception = re;
@@ -1836,22 +1839,22 @@ FSHParser.prototype.vsMetadata = function() {
     var localctx = new VsMetadataContext(this, this._ctx, this.state);
     this.enterRule(localctx, 24, FSHParser.RULE_vsMetadata);
     try {
-        this.state = 220;
+        this.state = 221;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.KW_ID:
             this.enterOuterAlt(localctx, 1);
-            this.state = 217;
+            this.state = 218;
             this.id();
             break;
         case FSHParser.KW_TITLE:
             this.enterOuterAlt(localctx, 2);
-            this.state = 218;
+            this.state = 219;
             this.title();
             break;
         case FSHParser.KW_DESCRIPTION:
             this.enterOuterAlt(localctx, 3);
-            this.state = 219;
+            this.state = 220;
             this.description();
             break;
         default:
@@ -1950,27 +1953,27 @@ FSHParser.prototype.codeSystem = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 222;
-        this.match(FSHParser.KW_CODESYSTEM);
         this.state = 223;
+        this.match(FSHParser.KW_CODESYSTEM);
+        this.state = 224;
         this.match(FSHParser.SEQUENCE);
-        this.state = 227;
+        this.state = 228;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_ID) | (1 << FSHParser.KW_TITLE) | (1 << FSHParser.KW_DESCRIPTION))) !== 0)) {
-            this.state = 224;
+            this.state = 225;
             this.csMetadata();
-            this.state = 229;
+            this.state = 230;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
-        this.state = 233;
+        this.state = 234;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while(_la===FSHParser.CODE) {
-            this.state = 230;
+            this.state = 231;
             this.concept();
-            this.state = 235;
+            this.state = 236;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
@@ -2047,22 +2050,22 @@ FSHParser.prototype.csMetadata = function() {
     var localctx = new CsMetadataContext(this, this._ctx, this.state);
     this.enterRule(localctx, 28, FSHParser.RULE_csMetadata);
     try {
-        this.state = 239;
+        this.state = 240;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.KW_ID:
             this.enterOuterAlt(localctx, 1);
-            this.state = 236;
+            this.state = 237;
             this.id();
             break;
         case FSHParser.KW_TITLE:
             this.enterOuterAlt(localctx, 2);
-            this.state = 237;
+            this.state = 238;
             this.title();
             break;
         case FSHParser.KW_DESCRIPTION:
             this.enterOuterAlt(localctx, 3);
-            this.state = 238;
+            this.state = 239;
             this.description();
             break;
         default:
@@ -2138,9 +2141,9 @@ FSHParser.prototype.parent = function() {
     this.enterRule(localctx, 30, FSHParser.RULE_parent);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 241;
-        this.match(FSHParser.KW_PARENT);
         this.state = 242;
+        this.match(FSHParser.KW_PARENT);
+        this.state = 243;
         this.match(FSHParser.SEQUENCE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2212,9 +2215,9 @@ FSHParser.prototype.id = function() {
     this.enterRule(localctx, 32, FSHParser.RULE_id);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 244;
-        this.match(FSHParser.KW_ID);
         this.state = 245;
+        this.match(FSHParser.KW_ID);
+        this.state = 246;
         this.match(FSHParser.SEQUENCE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2286,9 +2289,9 @@ FSHParser.prototype.title = function() {
     this.enterRule(localctx, 34, FSHParser.RULE_title);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 247;
-        this.match(FSHParser.KW_TITLE);
         this.state = 248;
+        this.match(FSHParser.KW_TITLE);
+        this.state = 249;
         this.match(FSHParser.STRING);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2365,9 +2368,9 @@ FSHParser.prototype.description = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 250;
-        this.match(FSHParser.KW_DESCRIPTION);
         this.state = 251;
+        this.match(FSHParser.KW_DESCRIPTION);
+        this.state = 252;
         _la = this._input.LA(1);
         if(!(_la===FSHParser.STRING || _la===FSHParser.MULTILINE_STRING)) {
         this._errHandler.recoverInline(this);
@@ -2446,9 +2449,9 @@ FSHParser.prototype.expression = function() {
     this.enterRule(localctx, 38, FSHParser.RULE_expression);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 253;
-        this.match(FSHParser.KW_EXPRESSION);
         this.state = 254;
+        this.match(FSHParser.KW_EXPRESSION);
+        this.state = 255;
         this.match(FSHParser.STRING);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2520,9 +2523,9 @@ FSHParser.prototype.xpath = function() {
     this.enterRule(localctx, 40, FSHParser.RULE_xpath);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 256;
-        this.match(FSHParser.KW_XPATH);
         this.state = 257;
+        this.match(FSHParser.KW_XPATH);
+        this.state = 258;
         this.match(FSHParser.STRING);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2594,9 +2597,9 @@ FSHParser.prototype.severity = function() {
     this.enterRule(localctx, 42, FSHParser.RULE_severity);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 259;
-        this.match(FSHParser.KW_SEVERITY);
         this.state = 260;
+        this.match(FSHParser.KW_SEVERITY);
+        this.state = 261;
         this.match(FSHParser.CODE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2668,9 +2671,9 @@ FSHParser.prototype.instanceOf = function() {
     this.enterRule(localctx, 44, FSHParser.RULE_instanceOf);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 262;
-        this.match(FSHParser.KW_INSTANCEOF);
         this.state = 263;
+        this.match(FSHParser.KW_INSTANCEOF);
+        this.state = 264;
         this.match(FSHParser.SEQUENCE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -2758,19 +2761,19 @@ FSHParser.prototype.cardRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 265;
-        this.match(FSHParser.STAR);
         this.state = 266;
-        this.path();
+        this.match(FSHParser.STAR);
         this.state = 267;
+        this.path();
+        this.state = 268;
         this.match(FSHParser.CARD);
-        this.state = 271;
+        this.state = 272;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_MOD) | (1 << FSHParser.KW_MS) | (1 << FSHParser.KW_SU))) !== 0)) {
-            this.state = 268;
+            this.state = 269;
             this.flag();
-            this.state = 273;
+            this.state = 274;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
@@ -2860,29 +2863,29 @@ FSHParser.prototype.flagRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 274;
+        this.state = 275;
         this.match(FSHParser.STAR);
-        this.state = 277;
+        this.state = 278;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.SEQUENCE:
-            this.state = 275;
+            this.state = 276;
             this.path();
             break;
         case FSHParser.COMMA_DELIMITED_SEQUENCES:
-            this.state = 276;
+            this.state = 277;
             this.paths();
             break;
         default:
             throw new antlr4.error.NoViableAltException(this);
         }
-        this.state = 280; 
+        this.state = 281; 
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         do {
-            this.state = 279;
+            this.state = 280;
             this.flag();
-            this.state = 282; 
+            this.state = 283; 
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         } while((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_MOD) | (1 << FSHParser.KW_MS) | (1 << FSHParser.KW_SU))) !== 0));
@@ -2969,19 +2972,19 @@ FSHParser.prototype.valueSetRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 284;
-        this.match(FSHParser.STAR);
         this.state = 285;
-        this.path();
+        this.match(FSHParser.STAR);
         this.state = 286;
-        this.match(FSHParser.KW_FROM);
+        this.path();
         this.state = 287;
+        this.match(FSHParser.KW_FROM);
+        this.state = 288;
         this.match(FSHParser.SEQUENCE);
-        this.state = 289;
+        this.state = 290;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         if((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_EXAMPLE) | (1 << FSHParser.KW_PREFERRED) | (1 << FSHParser.KW_EXTENSIBLE) | (1 << FSHParser.KW_REQUIRED))) !== 0)) {
-            this.state = 288;
+            this.state = 289;
             this.strength();
         }
 
@@ -3063,13 +3066,13 @@ FSHParser.prototype.fixedValueRule = function() {
     this.enterRule(localctx, 52, FSHParser.RULE_fixedValueRule);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 291;
-        this.match(FSHParser.STAR);
         this.state = 292;
-        this.path();
+        this.match(FSHParser.STAR);
         this.state = 293;
-        this.match(FSHParser.EQUAL);
+        this.path();
         this.state = 294;
+        this.match(FSHParser.EQUAL);
+        this.state = 295;
         this.value();
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -3169,23 +3172,23 @@ FSHParser.prototype.containsRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 296;
-        this.match(FSHParser.STAR);
         this.state = 297;
-        this.path();
+        this.match(FSHParser.STAR);
         this.state = 298;
-        this.match(FSHParser.KW_CONTAINS);
+        this.path();
         this.state = 299;
+        this.match(FSHParser.KW_CONTAINS);
+        this.state = 300;
         this.item();
-        this.state = 304;
+        this.state = 305;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while(_la===FSHParser.KW_AND) {
-            this.state = 300;
-            this.match(FSHParser.KW_AND);
             this.state = 301;
+            this.match(FSHParser.KW_AND);
+            this.state = 302;
             this.item();
-            this.state = 306;
+            this.state = 307;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
@@ -3287,23 +3290,23 @@ FSHParser.prototype.onlyRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 307;
-        this.match(FSHParser.STAR);
         this.state = 308;
-        this.path();
+        this.match(FSHParser.STAR);
         this.state = 309;
-        this.match(FSHParser.KW_ONLY);
+        this.path();
         this.state = 310;
+        this.match(FSHParser.KW_ONLY);
+        this.state = 311;
         this.targetType();
-        this.state = 315;
+        this.state = 316;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while(_la===FSHParser.KW_OR) {
-            this.state = 311;
-            this.match(FSHParser.KW_OR);
             this.state = 312;
+            this.match(FSHParser.KW_OR);
+            this.state = 313;
             this.targetType();
-            this.state = 317;
+            this.state = 318;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
@@ -3406,29 +3409,29 @@ FSHParser.prototype.obeysRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 318;
+        this.state = 319;
         this.match(FSHParser.STAR);
-        this.state = 320;
+        this.state = 321;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         if(_la===FSHParser.SEQUENCE) {
-            this.state = 319;
+            this.state = 320;
             this.path();
         }
 
-        this.state = 322;
-        this.match(FSHParser.KW_OBEYS);
         this.state = 323;
+        this.match(FSHParser.KW_OBEYS);
+        this.state = 324;
         this.match(FSHParser.SEQUENCE);
-        this.state = 328;
+        this.state = 329;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while(_la===FSHParser.KW_AND) {
-            this.state = 324;
-            this.match(FSHParser.KW_AND);
             this.state = 325;
+            this.match(FSHParser.KW_AND);
+            this.state = 326;
             this.match(FSHParser.SEQUENCE);
-            this.state = 330;
+            this.state = 331;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
@@ -3515,21 +3518,21 @@ FSHParser.prototype.caretValueRule = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 331;
+        this.state = 332;
         this.match(FSHParser.STAR);
-        this.state = 333;
+        this.state = 334;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         if(_la===FSHParser.SEQUENCE) {
-            this.state = 332;
+            this.state = 333;
             this.path();
         }
 
-        this.state = 335;
-        this.caretPath();
         this.state = 336;
-        this.match(FSHParser.EQUAL);
+        this.caretPath();
         this.state = 337;
+        this.match(FSHParser.EQUAL);
+        this.state = 338;
         this.value();
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -3610,26 +3613,26 @@ FSHParser.prototype.vsComponent = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 339;
+        this.state = 340;
         this.match(FSHParser.STAR);
-        this.state = 341;
+        this.state = 342;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         if(_la===FSHParser.KW_EXCLUDE) {
-            this.state = 340;
+            this.state = 341;
             this.match(FSHParser.KW_EXCLUDE);
         }
 
-        this.state = 345;
+        this.state = 346;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.CODE:
         case FSHParser.COMMA_DELIMITED_CODES:
-            this.state = 343;
+            this.state = 344;
             this.vsConceptComponent();
             break;
         case FSHParser.KW_CODES:
-            this.state = 344;
+            this.state = 345;
             this.vsFilterComponent();
             break;
         default:
@@ -3709,27 +3712,27 @@ FSHParser.prototype.vsConceptComponent = function() {
     this.enterRule(localctx, 64, FSHParser.RULE_vsConceptComponent);
     var _la = 0; // Token type
     try {
-        this.state = 353;
+        this.state = 354;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.CODE:
             this.enterOuterAlt(localctx, 1);
-            this.state = 347;
+            this.state = 348;
             this.code();
-            this.state = 349;
+            this.state = 350;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
             if(_la===FSHParser.KW_FROM) {
-                this.state = 348;
+                this.state = 349;
                 this.vsComponentFrom();
             }
 
             break;
         case FSHParser.COMMA_DELIMITED_CODES:
             this.enterOuterAlt(localctx, 2);
-            this.state = 351;
-            this.match(FSHParser.COMMA_DELIMITED_CODES);
             this.state = 352;
+            this.match(FSHParser.COMMA_DELIMITED_CODES);
+            this.state = 353;
             this.vsComponentFrom();
             break;
         default:
@@ -3814,17 +3817,17 @@ FSHParser.prototype.vsFilterComponent = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 355;
-        this.match(FSHParser.KW_CODES);
         this.state = 356;
+        this.match(FSHParser.KW_CODES);
+        this.state = 357;
         this.vsComponentFrom();
-        this.state = 359;
+        this.state = 360;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         if(_la===FSHParser.KW_WHERE) {
-            this.state = 357;
-            this.match(FSHParser.KW_WHERE);
             this.state = 358;
+            this.match(FSHParser.KW_WHERE);
+            this.state = 359;
             this.vsFilterList();
         }
 
@@ -3907,35 +3910,35 @@ FSHParser.prototype.vsComponentFrom = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 361;
+        this.state = 362;
         this.match(FSHParser.KW_FROM);
-        this.state = 372;
+        this.state = 373;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.KW_SYSTEM:
-            this.state = 362;
+            this.state = 363;
             this.vsFromSystem();
-            this.state = 365;
+            this.state = 366;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
             if(_la===FSHParser.KW_AND) {
-                this.state = 363;
-                this.match(FSHParser.KW_AND);
                 this.state = 364;
+                this.match(FSHParser.KW_AND);
+                this.state = 365;
                 this.vsFromValueset();
             }
 
             break;
         case FSHParser.KW_VSREFERENCE:
-            this.state = 367;
+            this.state = 368;
             this.vsFromValueset();
-            this.state = 370;
+            this.state = 371;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
             if(_la===FSHParser.KW_AND) {
-                this.state = 368;
-                this.match(FSHParser.KW_AND);
                 this.state = 369;
+                this.match(FSHParser.KW_AND);
+                this.state = 370;
                 this.vsFromSystem();
             }
 
@@ -4013,9 +4016,9 @@ FSHParser.prototype.vsFromSystem = function() {
     this.enterRule(localctx, 70, FSHParser.RULE_vsFromSystem);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 374;
-        this.match(FSHParser.KW_SYSTEM);
         this.state = 375;
+        this.match(FSHParser.KW_SYSTEM);
+        this.state = 376;
         this.match(FSHParser.SEQUENCE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -4052,6 +4055,10 @@ VsFromValuesetContext.prototype.KW_VSREFERENCE = function() {
     return this.getToken(FSHParser.KW_VSREFERENCE, 0);
 };
 
+VsFromValuesetContext.prototype.SEQUENCE = function() {
+    return this.getToken(FSHParser.SEQUENCE, 0);
+};
+
 VsFromValuesetContext.prototype.COMMA_DELIMITED_SEQUENCES = function() {
     return this.getToken(FSHParser.COMMA_DELIMITED_SEQUENCES, 0);
 };
@@ -4085,12 +4092,20 @@ FSHParser.prototype.vsFromValueset = function() {
 
     var localctx = new VsFromValuesetContext(this, this._ctx, this.state);
     this.enterRule(localctx, 72, FSHParser.RULE_vsFromValueset);
+    var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 377;
-        this.match(FSHParser.KW_VSREFERENCE);
         this.state = 378;
-        this.match(FSHParser.COMMA_DELIMITED_SEQUENCES);
+        this.match(FSHParser.KW_VSREFERENCE);
+        this.state = 379;
+        _la = this._input.LA(1);
+        if(!(_la===FSHParser.COMMA_DELIMITED_SEQUENCES || _la===FSHParser.SEQUENCE)) {
+        this._errHandler.recoverInline(this);
+        }
+        else {
+        	this._errHandler.reportMatch(this);
+            this.consume();
+        }
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
 	        localctx.exception = re;
@@ -4176,25 +4191,22 @@ FSHParser.prototype.vsFilterList = function() {
     this.enterRule(localctx, 74, FSHParser.RULE_vsFilterList);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 383; 
+        this.state = 386;
         this._errHandler.sync(this);
-        var _alt = 1;
-        do {
-        	switch (_alt) {
-        	case 1:
-        		this.state = 380;
-        		this.vsFilterDefinition();
-        		this.state = 381;
-        		this.match(FSHParser.KW_AND);
-        		break;
-        	default:
-        		throw new antlr4.error.NoViableAltException(this);
-        	}
-        	this.state = 385; 
-        	this._errHandler.sync(this);
-        	_alt = this._interp.adaptivePredict(this._input,36, this._ctx);
-        } while ( _alt!=2 && _alt!=antlr4.atn.ATN.INVALID_ALT_NUMBER );
-        this.state = 387;
+        var _alt = this._interp.adaptivePredict(this._input,36,this._ctx)
+        while(_alt!=2 && _alt!=antlr4.atn.ATN.INVALID_ALT_NUMBER) {
+            if(_alt===1) {
+                this.state = 381;
+                this.vsFilterDefinition();
+                this.state = 382;
+                this.match(FSHParser.KW_AND); 
+            }
+            this.state = 388;
+            this._errHandler.sync(this);
+            _alt = this._interp.adaptivePredict(this._input,36,this._ctx);
+        }
+
+        this.state = 389;
         this.vsFilterDefinition();
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -4268,14 +4280,21 @@ FSHParser.prototype.vsFilterDefinition = function() {
 
     var localctx = new VsFilterDefinitionContext(this, this._ctx, this.state);
     this.enterRule(localctx, 76, FSHParser.RULE_vsFilterDefinition);
+    var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 389;
+        this.state = 391;
         this.match(FSHParser.SEQUENCE);
-        this.state = 390;
+        this.state = 392;
         this.vsFilterOperator();
-        this.state = 391;
-        this.vsFilterValue();
+        this.state = 394;
+        this._errHandler.sync(this);
+        _la = this._input.LA(1);
+        if(((((_la - 29)) & ~0x1f) == 0 && ((1 << (_la - 29)) & ((1 << (FSHParser.KW_TRUE - 29)) | (1 << (FSHParser.KW_FALSE - 29)) | (1 << (FSHParser.STRING - 29)) | (1 << (FSHParser.CODE - 29)) | (1 << (FSHParser.REGEX - 29)))) !== 0)) {
+            this.state = 393;
+            this.vsFilterValue();
+        }
+
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
 	        localctx.exception = re;
@@ -4347,7 +4366,7 @@ FSHParser.prototype.vsFilterOperator = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 393;
+        this.state = 396;
         _la = this._input.LA(1);
         if(!(_la===FSHParser.EQUAL || _la===FSHParser.SEQUENCE)) {
         this._errHandler.recoverInline(this);
@@ -4391,16 +4410,20 @@ VsFilterValueContext.prototype.code = function() {
     return this.getTypedRuleContext(CodeContext,0);
 };
 
-VsFilterValueContext.prototype.REGEX = function() {
-    return this.getToken(FSHParser.REGEX, 0);
+VsFilterValueContext.prototype.KW_TRUE = function() {
+    return this.getToken(FSHParser.KW_TRUE, 0);
 };
 
-VsFilterValueContext.prototype.COMMA_DELIMITED_SEQUENCES = function() {
-    return this.getToken(FSHParser.COMMA_DELIMITED_SEQUENCES, 0);
+VsFilterValueContext.prototype.KW_FALSE = function() {
+    return this.getToken(FSHParser.KW_FALSE, 0);
 };
 
-VsFilterValueContext.prototype.SEQUENCE = function() {
-    return this.getToken(FSHParser.SEQUENCE, 0);
+VsFilterValueContext.prototype.REGEX = function() {
+    return this.getToken(FSHParser.REGEX, 0);
+};
+
+VsFilterValueContext.prototype.STRING = function() {
+    return this.getToken(FSHParser.STRING, 0);
 };
 
 VsFilterValueContext.prototype.enterRule = function(listener) {
@@ -4433,28 +4456,33 @@ FSHParser.prototype.vsFilterValue = function() {
     var localctx = new VsFilterValueContext(this, this._ctx, this.state);
     this.enterRule(localctx, 80, FSHParser.RULE_vsFilterValue);
     try {
-        this.state = 399;
+        this.state = 403;
         this._errHandler.sync(this);
         switch(this._input.LA(1)) {
         case FSHParser.CODE:
             this.enterOuterAlt(localctx, 1);
-            this.state = 395;
+            this.state = 398;
             this.code();
             break;
-        case FSHParser.REGEX:
+        case FSHParser.KW_TRUE:
             this.enterOuterAlt(localctx, 2);
-            this.state = 396;
-            this.match(FSHParser.REGEX);
+            this.state = 399;
+            this.match(FSHParser.KW_TRUE);
             break;
-        case FSHParser.COMMA_DELIMITED_SEQUENCES:
+        case FSHParser.KW_FALSE:
             this.enterOuterAlt(localctx, 3);
-            this.state = 397;
-            this.match(FSHParser.COMMA_DELIMITED_SEQUENCES);
+            this.state = 400;
+            this.match(FSHParser.KW_FALSE);
             break;
-        case FSHParser.SEQUENCE:
+        case FSHParser.REGEX:
             this.enterOuterAlt(localctx, 4);
-            this.state = 398;
-            this.match(FSHParser.SEQUENCE);
+            this.state = 401;
+            this.match(FSHParser.REGEX);
+            break;
+        case FSHParser.STRING:
+            this.enterOuterAlt(localctx, 5);
+            this.state = 402;
+            this.match(FSHParser.STRING);
             break;
         default:
             throw new antlr4.error.NoViableAltException(this);
@@ -4525,7 +4553,7 @@ FSHParser.prototype.path = function() {
     this.enterRule(localctx, 82, FSHParser.RULE_path);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 401;
+        this.state = 405;
         this.match(FSHParser.SEQUENCE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -4593,7 +4621,7 @@ FSHParser.prototype.paths = function() {
     this.enterRule(localctx, 84, FSHParser.RULE_paths);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 403;
+        this.state = 407;
         this.match(FSHParser.COMMA_DELIMITED_SEQUENCES);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -4661,7 +4689,7 @@ FSHParser.prototype.caretPath = function() {
     this.enterRule(localctx, 86, FSHParser.RULE_caretPath);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 405;
+        this.state = 409;
         this.match(FSHParser.CARET_SEQUENCE);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -4738,7 +4766,7 @@ FSHParser.prototype.flag = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 407;
+        this.state = 411;
         _la = this._input.LA(1);
         if(!((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_MOD) | (1 << FSHParser.KW_MS) | (1 << FSHParser.KW_SU))) !== 0))) {
         this._errHandler.recoverInline(this);
@@ -4826,7 +4854,7 @@ FSHParser.prototype.strength = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 409;
+        this.state = 413;
         _la = this._input.LA(1);
         if(!((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_EXAMPLE) | (1 << FSHParser.KW_PREFERRED) | (1 << FSHParser.KW_EXTENSIBLE) | (1 << FSHParser.KW_REQUIRED))) !== 0))) {
         this._errHandler.recoverInline(this);
@@ -4932,61 +4960,61 @@ FSHParser.prototype.value = function() {
     var localctx = new ValueContext(this, this._ctx, this.state);
     this.enterRule(localctx, 92, FSHParser.RULE_value);
     try {
-        this.state = 420;
+        this.state = 424;
         this._errHandler.sync(this);
-        var la_ = this._interp.adaptivePredict(this._input,38,this._ctx);
+        var la_ = this._interp.adaptivePredict(this._input,39,this._ctx);
         switch(la_) {
         case 1:
             this.enterOuterAlt(localctx, 1);
-            this.state = 411;
+            this.state = 415;
             this.match(FSHParser.STRING);
             break;
 
         case 2:
             this.enterOuterAlt(localctx, 2);
-            this.state = 412;
+            this.state = 416;
             this.match(FSHParser.MULTILINE_STRING);
             break;
 
         case 3:
             this.enterOuterAlt(localctx, 3);
-            this.state = 413;
+            this.state = 417;
             this.match(FSHParser.NUMBER);
             break;
 
         case 4:
             this.enterOuterAlt(localctx, 4);
-            this.state = 414;
+            this.state = 418;
             this.match(FSHParser.DATETIME);
             break;
 
         case 5:
             this.enterOuterAlt(localctx, 5);
-            this.state = 415;
+            this.state = 419;
             this.match(FSHParser.TIME);
             break;
 
         case 6:
             this.enterOuterAlt(localctx, 6);
-            this.state = 416;
+            this.state = 420;
             this.code();
             break;
 
         case 7:
             this.enterOuterAlt(localctx, 7);
-            this.state = 417;
+            this.state = 421;
             this.quantity();
             break;
 
         case 8:
             this.enterOuterAlt(localctx, 8);
-            this.state = 418;
+            this.state = 422;
             this.ratio();
             break;
 
         case 9:
             this.enterOuterAlt(localctx, 9);
-            this.state = 419;
+            this.state = 423;
             this.bool();
             break;
 
@@ -5073,17 +5101,17 @@ FSHParser.prototype.item = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 422;
+        this.state = 426;
         this.match(FSHParser.SEQUENCE);
-        this.state = 423;
-        this.match(FSHParser.CARD);
         this.state = 427;
+        this.match(FSHParser.CARD);
+        this.state = 431;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         while((((_la) & ~0x1f) == 0 && ((1 << _la) & ((1 << FSHParser.KW_MOD) | (1 << FSHParser.KW_MS) | (1 << FSHParser.KW_SU))) !== 0)) {
-            this.state = 424;
+            this.state = 428;
             this.flag();
-            this.state = 429;
+            this.state = 433;
             this._errHandler.sync(this);
             _la = this._input.LA(1);
         }
@@ -5157,13 +5185,13 @@ FSHParser.prototype.code = function() {
     this.enterRule(localctx, 96, FSHParser.RULE_code);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 430;
+        this.state = 434;
         this.match(FSHParser.CODE);
-        this.state = 432;
+        this.state = 436;
         this._errHandler.sync(this);
-        var la_ = this._interp.adaptivePredict(this._input,40,this._ctx);
+        var la_ = this._interp.adaptivePredict(this._input,41,this._ctx);
         if(la_===1) {
-            this.state = 431;
+            this.state = 435;
             this.match(FSHParser.STRING);
 
         }
@@ -5238,13 +5266,13 @@ FSHParser.prototype.concept = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 434;
+        this.state = 438;
         this.code();
-        this.state = 436;
+        this.state = 440;
         this._errHandler.sync(this);
         _la = this._input.LA(1);
         if(_la===FSHParser.STRING) {
-            this.state = 435;
+            this.state = 439;
             this.match(FSHParser.STRING);
         }
 
@@ -5318,9 +5346,9 @@ FSHParser.prototype.quantity = function() {
     this.enterRule(localctx, 100, FSHParser.RULE_quantity);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 438;
+        this.state = 442;
         this.match(FSHParser.NUMBER);
-        this.state = 439;
+        this.state = 443;
         this.match(FSHParser.UNIT);
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -5399,11 +5427,11 @@ FSHParser.prototype.ratio = function() {
     this.enterRule(localctx, 102, FSHParser.RULE_ratio);
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 441;
+        this.state = 445;
         this.ratioPart();
-        this.state = 442;
+        this.state = 446;
         this.match(FSHParser.COLON);
-        this.state = 443;
+        this.state = 447;
         this.ratioPart();
     } catch (re) {
     	if(re instanceof antlr4.error.RecognitionException) {
@@ -5474,19 +5502,19 @@ FSHParser.prototype.ratioPart = function() {
     var localctx = new RatioPartContext(this, this._ctx, this.state);
     this.enterRule(localctx, 104, FSHParser.RULE_ratioPart);
     try {
-        this.state = 447;
+        this.state = 451;
         this._errHandler.sync(this);
-        var la_ = this._interp.adaptivePredict(this._input,42,this._ctx);
+        var la_ = this._interp.adaptivePredict(this._input,43,this._ctx);
         switch(la_) {
         case 1:
             this.enterOuterAlt(localctx, 1);
-            this.state = 445;
+            this.state = 449;
             this.match(FSHParser.NUMBER);
             break;
 
         case 2:
             this.enterOuterAlt(localctx, 2);
-            this.state = 446;
+            this.state = 450;
             this.quantity();
             break;
 
@@ -5562,7 +5590,7 @@ FSHParser.prototype.bool = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 449;
+        this.state = 453;
         _la = this._input.LA(1);
         if(!(_la===FSHParser.KW_TRUE || _la===FSHParser.KW_FALSE)) {
         this._errHandler.recoverInline(this);
@@ -5642,7 +5670,7 @@ FSHParser.prototype.targetType = function() {
     var _la = 0; // Token type
     try {
         this.enterOuterAlt(localctx, 1);
-        this.state = 451;
+        this.state = 455;
         _la = this._input.LA(1);
         if(!(_la===FSHParser.REFERENCE || _la===FSHParser.SEQUENCE)) {
         this._errHandler.recoverInline(this);
diff --git a/src/import/parserContexts.ts b/src/import/parserContexts.ts
index fd71bc3..0d999fb 100644
--- a/src/import/parserContexts.ts
+++ b/src/import/parserContexts.ts
@@ -227,7 +227,7 @@ export interface VsComponentContext extends ParserRuleContext {
 }
 
 export interface VsConceptComponentContext extends ParserRuleContext {
-  code(): CodeContext[];
+  code(): CodeContext;
   vsComponentFrom(): VsComponentFromContext;
   COMMA_DELIMITED_CODES(): ParserRuleContext;
 }
@@ -252,6 +252,7 @@ export interface VsFromSystemContext extends ParserRuleContext {
 
 export interface VsFromValuesetContext extends ParserRuleContext {
   KW_VSREFERENCE(): ParserRuleContext;
+  SEQUENCE(): ParserRuleContext;
   COMMA_DELIMITED_SEQUENCES(): ParserRuleContext;
 }
 
@@ -272,7 +273,8 @@ export interface VsFilterOperatorContext extends ParserRuleContext {
 
 export interface VsFilterValueContext extends ParserRuleContext {
   code(): CodeContext;
+  KW_TRUE(): ParserRuleContext;
+  KW_FALSE(): ParserRuleContext;
   REGEX(): ParserRuleContext;
-  COMMA_DELIMITED_SEQUENCES(): ParserRuleContext;
-  SEQUENCE(): ParserRuleContext;
+  STRING(): ParserRuleContext;
 }


Test patch:
diff --git a/test/fshtypes/ValueSet.test.ts b/test/fshtypes/ValueSet.test.ts
index c92dd04..15d0ebb 100644
--- a/test/fshtypes/ValueSet.test.ts
+++ b/test/fshtypes/ValueSet.test.ts
@@ -7,10 +7,9 @@ describe('ValueSet', () => {
       const vs = new ValueSet('MyValueSet');
       expect(vs.name).toBe('MyValueSet');
       expect(vs.id).toBe('MyValueSet');
-      expect(vs.url).toBeUndefined();
+      expect(vs.title).toBeUndefined();
       expect(vs.description).toBeUndefined();
-      expect(vs.inclusions).toBeEmpty();
-      expect(vs.exclusions).toBeEmpty();
+      expect(vs.components).toBeEmpty();
     });
   });
 });
diff --git a/test/import/FSHImporter.ValueSet.test.ts b/test/import/FSHImporter.ValueSet.test.ts
new file mode 100644
index 0000000..5b70878
--- /dev/null
+++ b/test/import/FSHImporter.ValueSet.test.ts
@@ -0,0 +1,666 @@
+import { importText } from '../../src/import';
+import {
+  assertValueSetConceptComponent,
+  assertValueSetFilterComponent
+} from '../testhelpers/asserts';
+import { loggerSpy } from '../testhelpers/loggerSpy';
+import { FshCode, VsProperty, VsOperator } from '../../src/fshtypes';
+
+describe('FSHImporter', () => {
+  describe('ValueSet', () => {
+    describe('#vsMetadata', () => {
+      it('should parse a value set with additional metadata', () => {
+        const input = `
+        ValueSet: SimpleVS
+        Id: SimpleVS_ID
+        Title: "Simple Value Set"
+        Description: "A simple value set for testing metadata"
+        `;
+        const result = importText(input, 'Simple.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('SimpleVS');
+        expect(valueSet.name).toBe('SimpleVS');
+        expect(valueSet.id).toBe('SimpleVS_ID');
+        expect(valueSet.title).toBe('Simple Value Set');
+        expect(valueSet.description).toBe('A simple value set for testing metadata');
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 5,
+          endColumn: 62
+        });
+        expect(valueSet.sourceInfo.file).toBe('Simple.fsh');
+      });
+
+      it('should only apply each metadata attribute the first time it is declared', () => {
+        const input = `
+        ValueSet: SimpleVS
+        Id: SimpleVS_ID
+        Title: "Simple Value Set"
+        Description: "A simple value set for testing metadata"
+        Id: DuplicateVS_ID
+        Title: "Duplicate Value Set"
+        Description: "A duplicate value set for testing metadata"
+        `;
+        const result = importText(input, 'Dupe.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('SimpleVS');
+        expect(valueSet.name).toBe('SimpleVS');
+        expect(valueSet.id).toBe('SimpleVS_ID');
+        expect(valueSet.title).toBe('Simple Value Set');
+        expect(valueSet.description).toBe('A simple value set for testing metadata');
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 8,
+          endColumn: 65
+        });
+        expect(valueSet.sourceInfo.file).toBe('Dupe.fsh');
+      });
+
+      it('should log an error when encountering a duplicate metadata attribute', () => {
+        const input = `
+        ValueSet: SimpleVS
+        Id: SimpleVS_ID
+        Title: "Simple Value Set"
+        Description: "A simple value set for testing metadata"
+        Id: DuplicateVS_ID
+        Title: "Duplicate Value Set"
+        Description: "A duplicate value set for testing metadata"
+        `;
+        importText(input, 'Dupe.fsh');
+        expect(loggerSpy.getMessageAtIndex(-3)).toMatch(/File: Dupe\.fsh.*Line: 6\D/s);
+        expect(loggerSpy.getMessageAtIndex(-2)).toMatch(/File: Dupe\.fsh.*Line: 7\D/s);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Dupe\.fsh.*Line: 8\D/s);
+      });
+    });
+
+    describe('#ValueSetConceptComponent', () => {
+      it('should parse a value set with a concept specified as SYSTEM#code', () => {
+        const input = `
+        ValueSet: SimpleVS
+        * ZOO#bear
+        `;
+        const result = importText(input, 'Simple.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('SimpleVS');
+        expect(valueSet.name).toBe('SimpleVS');
+        expect(valueSet.id).toBe('SimpleVS');
+        expect(valueSet.description).toBeUndefined();
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetConceptComponent(valueSet.components[0], 'ZOO', undefined, [
+          new FshCode('bear', 'ZOO').withLocation([3, 11, 3, 18]).withFile('Simple.fsh')
+        ]);
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 3,
+          endColumn: 18
+        });
+        expect(valueSet.sourceInfo.file).toBe('Simple.fsh');
+      });
+
+      it('should parse a value set with a concept specified as #code from SYSTEM', () => {
+        const input = `
+        ValueSet: ZooVS
+        * #hippo "Hippopotamus" from system ZOO
+        `;
+
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetConceptComponent(valueSet.components[0], 'ZOO', undefined, [
+          new FshCode('hippo', 'ZOO', 'Hippopotamus')
+            .withLocation([3, 11, 3, 31])
+            .withFile('Zoo.fsh')
+        ]);
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 3,
+          endColumn: 47
+        });
+        expect(valueSet.sourceInfo.file).toBe('Zoo.fsh');
+      });
+
+      it('should parse a value set with a list of concepts', () => {
+        const input = `
+        ValueSet: ZooVS
+        * #hippo "Hippopotamus", #crocodile "Crocodile" from system ZOO
+        `;
+
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetConceptComponent(valueSet.components[0], 'ZOO', undefined, [
+          new FshCode('hippo', 'ZOO', 'Hippopotamus')
+            .withLocation([3, 11, 3, 55])
+            .withFile('Zoo.fsh'),
+          new FshCode('crocodile', 'ZOO', 'Crocodile')
+            .withLocation([3, 11, 3, 55])
+            .withFile('Zoo.fsh')
+        ]);
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 3,
+          endColumn: 71
+        });
+        expect(valueSet.sourceInfo.file).toBe('Zoo.fsh');
+      });
+
+      it('should log an error when a concept component does not have a system', () => {
+        const input = `
+        ValueSet: ZooVS
+        * #hippo
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetConceptComponent(valueSet.components[0], undefined, undefined, []);
+        expect(loggerSpy.getLastMessage()).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 = `
+        ValueSet: ZooVS
+        * ZOO#hippo from system ZOO
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetConceptComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Zoo\.fsh.*Line: 3\D/s);
+      });
+    });
+    describe('#ValueSetFilterComponent', () => {
+      it('should parse a value set that includes all codes from a system', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 3,
+          endColumn: 31
+        });
+        expect(valueSet.sourceInfo.file).toBe('Zoo.fsh');
+      });
+
+      it('should parse a value set that includes all codes from other value sets', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from valueset FirstZooVS
+        * codes from valueset SecondZooVS, ThirdZooVS
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(2);
+        assertValueSetFilterComponent(valueSet.components[0], undefined, ['FirstZooVS'], []);
+        assertValueSetFilterComponent(
+          valueSet.components[1],
+          undefined,
+          ['SecondZooVS', 'ThirdZooVS'],
+          []
+        );
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 4,
+          endColumn: 53
+        });
+        expect(valueSet.sourceInfo.file).toBe('Zoo.fsh');
+      });
+
+      it('should parse a value set that includes all codes from a system and other value sets', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO and valueset NorthZooVS, SouthZooVS
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(
+          valueSet.components[0],
+          'ZOO',
+          ['NorthZooVS', 'SouthZooVS'],
+          []
+        );
+        expect(valueSet.sourceInfo.location).toEqual({
+          startLine: 2,
+          startColumn: 9,
+          endLine: 3,
+          endColumn: 67
+        });
+        expect(valueSet.sourceInfo.file).toBe('Zoo.fsh');
+      });
+
+      it('should parse a value set that uses filter operator =', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where version = "2.0"
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.VERSION,
+            operator: VsOperator.EQUALS,
+            value: '2.0'
+          }
+        ]);
+      });
+
+      it('should log an error when the = filter has a non-string value', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where version = /[1-9].*/
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"=".*string/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Zoo\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator is-a', () => {
+        const input = `
+        ValueSet: AllUrsinesVS
+        * codes from system ZOO where code is-a #bear "Bear"
+        `;
+        const result = importText(input, 'Ursines.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('AllUrsinesVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.CODE,
+            operator: VsOperator.IS_A,
+            value: new FshCode('bear', undefined, 'Bear')
+              .withLocation([3, 49, 3, 60])
+              .withFile('Ursines.fsh')
+          }
+        ]);
+      });
+
+      it('should log an error when the is-a filter has a non-code value', () => {
+        const input = `
+        ValueSet: AllUrsinesVS
+        * codes from system ZOO where code is-a "Bear"
+        `;
+        const result = importText(input, 'Ursines.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('AllUrsinesVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"is-a".*code/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Ursines\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator descendent-of', () => {
+        const input = `
+        ValueSet: AllFelinesVS
+        * codes from valueset ZooVS where code descendent-of ZOO#cat
+        `;
+        const result = importText(input, 'Felines.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('AllFelinesVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(
+          valueSet.components[0],
+          undefined,
+          ['ZooVS'],
+          [
+            {
+              property: VsProperty.CODE,
+              operator: VsOperator.DESCENDENT_OF,
+              value: new FshCode('cat', 'ZOO', undefined)
+                .withLocation([3, 62, 3, 68])
+                .withFile('Felines.fsh')
+            }
+          ]
+        );
+      });
+
+      it('should parse a value set that uses filter operator descendant-of, which is the same as descendent-of, but spelled correctly', () => {
+        const input = `
+        ValueSet: AllFelinesVS
+        * codes from valueset ZooVS where code descendant-of ZOO#cat
+        `;
+        const result = importText(input, 'Felines.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('AllFelinesVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(
+          valueSet.components[0],
+          undefined,
+          ['ZooVS'],
+          [
+            {
+              property: VsProperty.CODE,
+              operator: VsOperator.DESCENDENT_OF,
+              value: new FshCode('cat', 'ZOO', undefined)
+                .withLocation([3, 62, 3, 68])
+                .withFile('Felines.fsh')
+            }
+          ]
+        );
+      });
+
+      it('should log an error when the descendent-of filter has a non-code value', () => {
+        const input = `
+        ValueSet: AllFelinesVS
+        * codes from valueset ZooVS where code descendent-of "Cat"
+        `;
+        const result = importText(input, 'Felines.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('AllFelinesVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], undefined, ['ZooVS'], []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"descendent-of".*code/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Felines\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator is-not-a', () => {
+        const input = `
+        ValueSet: NonCanineVS
+        * codes from system ZOO where code is-not-a #dog
+        `;
+        const result = importText(input, 'NonCanine.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('NonCanineVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.CODE,
+            operator: VsOperator.IS_NOT_A,
+            value: new FshCode('dog', undefined, undefined)
+              .withLocation([3, 53, 3, 56])
+              .withFile('NonCanine.fsh')
+          }
+        ]);
+      });
+
+      it('should log an error when the is-not-a filter has a non-code value', () => {
+        const input = `
+        ValueSet: NonCanineVS
+        * codes from system ZOO where code is-not-a "dog"
+        `;
+        const result = importText(input, 'NonCanine.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('NonCanineVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"is-not-a".*code/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: NonCanine\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator regex', () => {
+        const input = `
+        ValueSet: ProbablyDogsVS
+        * codes from system ZOO where display regex /([Dd]og)|([Cc]anine)/
+        `;
+        const result = importText(input, 'MostlyDogs.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ProbablyDogsVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.DISPLAY,
+            operator: VsOperator.REGEX,
+            value: /([Dd]og)|([Cc]anine)/
+          }
+        ]);
+      });
+
+      it('should log an error when the regex filter has a non-regex value', () => {
+        const input = `
+        ValueSet: ProbablyDogsVS
+        * codes from system ZOO where display regex "Dog|Canine"
+        `;
+        const result = importText(input, 'MostlyDogs.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ProbablyDogsVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"regex".*regex/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: MostlyDogs\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator in', () => {
+        const input = `
+        ValueSet: CatAndDogVS
+        * codes from system ZOO where code in "#cat, #dog"
+        `;
+        const result = importText(input, 'CatDog.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('CatAndDogVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.CODE,
+            operator: VsOperator.IN,
+            value: '#cat, #dog'
+          }
+        ]);
+      });
+
+      it('should log an error when the in filter has a non-string value', () => {
+        const input = `
+        ValueSet: CatAndDogVS
+        * codes from system ZOO where code in ZOO#cat
+        `;
+        const result = importText(input, 'CatDog.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('CatAndDogVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"in".*string/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: CatDog\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator not-in', () => {
+        const input = `
+        ValueSet: NoGooseVS
+        * codes from system ZOO where code not-in "#goose"
+        `;
+        const result = importText(input, 'NoGoose.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('NoGooseVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.CODE,
+            operator: VsOperator.NOT_IN,
+            value: '#goose'
+          }
+        ]);
+      });
+
+      it('should log an error when the not-in filter has a non-string value', () => {
+        const input = `
+        ValueSet: NoGooseVS
+        * codes from system ZOO where code not-in /duck|goose/
+        `;
+        const result = importText(input, 'NoGoose.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('NoGooseVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"not-in".*string/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: NoGoose\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator generalizes', () => {
+        const input = `
+        ValueSet: MustelidVS
+        * codes from system ZOO where code generalizes #mustela-nivalis "least weasel"
+        `;
+        const result = importText(input, 'Mustelids.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('MustelidVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.CODE,
+            operator: VsOperator.GENERALIZES,
+            value: new FshCode('mustela-nivalis', undefined, 'least weasel')
+              .withLocation([3, 56, 3, 86])
+              .withFile('Mustelids.fsh')
+          }
+        ]);
+      });
+
+      it('should log an error when the generalizes filter has a non-code value', () => {
+        const input = `
+        ValueSet: MustelidVS
+        * codes from system ZOO where code generalizes "least weasel"
+        `;
+        const result = importText(input, 'Mustelids.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('MustelidVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"generalizes".*code/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Mustelids\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses filter operator exists', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where display exists true
+        * codes from system ZOO where version exists
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(2);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.DISPLAY,
+            operator: VsOperator.EXISTS,
+            value: true
+          }
+        ]);
+        assertValueSetFilterComponent(valueSet.components[1], 'ZOO', undefined, [
+          {
+            property: VsProperty.VERSION,
+            operator: VsOperator.EXISTS,
+            value: true
+          }
+        ]);
+      });
+
+      it('should log an error when the exists filter has a non-boolean value', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where display exists "display"
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/"exists".*boolean/);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Zoo\.fsh.*Line: 3\D/s);
+      });
+
+      it('should parse a value set that uses multiple filters on a single component', () => {
+        const input = `
+        ValueSet: ZooTwoVS
+        * codes from system ZOO where version regex /2\\./ and display exists
+        `;
+        const result = importText(input, 'ZooTwo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooTwoVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, [
+          {
+            property: VsProperty.VERSION,
+            operator: VsOperator.REGEX,
+            value: /2\./
+          },
+          {
+            property: VsProperty.DISPLAY,
+            operator: VsOperator.EXISTS,
+            value: true
+          }
+        ]);
+      });
+
+      it('should parse a value set with an excluded component', () => {
+        const input = `
+        ValueSet: AvailableVS
+        * codes from system ZOO
+        * exclude codes from valueset UnavailableAnimalVS
+        `;
+        const result = importText(input, 'Available.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('AvailableVS');
+        expect(valueSet.components.length).toBe(2);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        assertValueSetFilterComponent(
+          valueSet.components[1],
+          undefined,
+          ['UnavailableAnimalVS'],
+          [],
+          false
+        );
+      });
+
+      it('should log an error when a filter has an invalid property', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where animal exists true
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Zoo\.fsh.*Line: 3\D/s);
+      });
+
+      it('should log an error when a filter has an invalid operator', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where display resembles "cat"
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Zoo\.fsh.*Line: 3\D/s);
+      });
+
+      it('should log an error when a filter (other than the exists filter) has no value', () => {
+        const input = `
+        ValueSet: ZooVS
+        * codes from system ZOO where display regex
+        `;
+        const result = importText(input, 'Zoo.fsh');
+        expect(result.valueSets.size).toBe(1);
+        const valueSet = result.valueSets.get('ZooVS');
+        expect(valueSet.components.length).toBe(1);
+        assertValueSetFilterComponent(valueSet.components[0], 'ZOO', undefined, []);
+        expect(loggerSpy.getLastMessage()).toMatch(/File: Zoo\.fsh.*Line: 3\D/s);
+      });
+    });
+  });
+});
diff --git a/test/testhelpers/asserts.ts b/test/testhelpers/asserts.ts
index f59cd1f..25fb71e 100644
--- a/test/testhelpers/asserts.ts
+++ b/test/testhelpers/asserts.ts
@@ -10,6 +10,13 @@ import {
   ContainsRule,
   CaretValueRule
 } from '../../src/fshtypes/rules';
+import {
+  ValueSetComponent,
+  ValueSetConceptComponent,
+  FshCode,
+  ValueSetFilterComponent,
+  ValueSetFilter
+} from '../../src/fshtypes';
 
 export function assertCardRule(rule: Rule, path: string, min: number, max: number | string): void {
   expect(rule).toBeInstanceOf(CardRule);
@@ -81,3 +88,31 @@ export function assertCaretValueRule(
   expect(caretValueRule.caretPath).toBe(caretPath);
   expect(caretValueRule.value).toEqual(value);
 }
+
+export function assertValueSetConceptComponent(
+  component: ValueSetComponent,
+  fromSystem: string,
+  fromValueSets: string[],
+  concepts: FshCode[]
+): void {
+  expect(component).toBeInstanceOf(ValueSetConceptComponent);
+  const conceptComponent = component as ValueSetConceptComponent;
+  expect(conceptComponent.from.system).toBe(fromSystem);
+  expect(conceptComponent.from.valueSets).toEqual(fromValueSets);
+  expect(conceptComponent.concepts).toEqual(concepts);
+}
+
+export function assertValueSetFilterComponent(
+  component: ValueSetComponent,
+  fromSystem: string,
+  fromValueSets: string[],
+  filters: ValueSetFilter[],
+  included = true
+): void {
+  expect(component).toBeInstanceOf(ValueSetFilterComponent);
+  const filterComponent = component as ValueSetFilterComponent;
+  expect(filterComponent.from.system).toBe(fromSystem);
+  expect(filterComponent.from.valueSets).toEqual(fromValueSets);
+  expect(filterComponent.filters).toEqual(filters);
+  expect(filterComponent.inclusion).toBe(included);
+}