Repository: miekg/dns
Pull request #1515 (2023-11-17 12:44:36)

Add ISDN record
We had the type code, this add the rest. Other RRs from 1183 are also
fully impl. don't know why this one wasn't.

Signed-off-by: Miek Gieben <miek@miek.nl>



Patch:
diff --git a/README.md b/README.md
index 95bc08d5..e57d86af 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,7 @@ A not-so-up-to-date-list-that-may-be-actually-current:
 * https://dnscheck.tools/
 * https://github.com/egbakou/domainverifier
 * https://github.com/semihalev/sdns
+* https://github.com/wintbiit/NineDNS
 
 
 Send pull request if you want to be listed here.
@@ -125,6 +126,7 @@ Example programs can be found in the `github.com/miekg/exdns` repository.
 *all of them*
 
 * 103{4,5} - DNS standard
+* 1183 - ISDN, X25 and other deprecated records
 * 1348 - NSAP record (removed the record)
 * 1982 - Serial Arithmetic
 * 1876 - LOC record
diff --git a/dnssec_keyscan.go b/dnssec_keyscan.go
index 5e72249b..9c9972db 100644
--- a/dnssec_keyscan.go
+++ b/dnssec_keyscan.go
@@ -160,7 +160,7 @@ func parseKey(r io.Reader, file string) (map[string]string, error) {
 			k = l.token
 		case zValue:
 			if k == "" {
-				return nil, &ParseError{file, "no private key seen", l}
+				return nil, &ParseError{file: file, err: "no private key seen", lex: l}
 			}
 
 			m[strings.ToLower(k)] = l.token
diff --git a/generate.go b/generate.go
index 713e9d2d..a81d2bc5 100644
--- a/generate.go
+++ b/generate.go
@@ -116,7 +116,7 @@ func (r *generateReader) parseError(msg string, end int) *ParseError {
 	l.token = r.s[r.si-1 : end]
 	l.column += r.si // l.column starts one zBLANK before r.s
 
-	return &ParseError{r.file, msg, l}
+	return &ParseError{file: r.file, err: msg, lex: l}
 }
 
 func (r *generateReader) Read(p []byte) (int, error) {
diff --git a/go.mod b/go.mod
index 51010bba..f2d2cc4a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,9 +3,9 @@ module github.com/miekg/dns
 go 1.19
 
 require (
-	golang.org/x/net v0.17.0
+	golang.org/x/net v0.19.0
 	golang.org/x/sync v0.4.0
-	golang.org/x/sys v0.13.0
+	golang.org/x/sys v0.15.0
 	golang.org/x/tools v0.13.0
 )
 
diff --git a/go.sum b/go.sum
index 9bca0cb1..5c0a5a61 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,10 @@
 golang.org/x/mod v0.12.0 h1:rmsUpXtvNzj340zd98LZ4KntptpfRHwpFOHG188oHXc=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
-golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+golang.org/x/net v0.19.0 h1:zTwKpTd2XuCqf8huc7Fo2iSy+4RHPd10s4KzeTnVr1c=
+golang.org/x/net v0.19.0/go.mod h1:CfAk/cbD4CthTvqiEl8NpboMuiuOYsAr/7NOjZJtv1U=
 golang.org/x/sync v0.4.0 h1:zxkM55ReGkDlKSM+Fu41A+zmbZuaPVbGMzvvdUPznYQ=
 golang.org/x/sync v0.4.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
+golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/tools v0.13.0 h1:Iey4qkscZuv0VvIt8E0neZjtPVQFSc870HQ448QgEmQ=
 golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
diff --git a/privaterr.go b/privaterr.go
index d256b652..350ea5a4 100644
--- a/privaterr.go
+++ b/privaterr.go
@@ -84,7 +84,7 @@ Fetch:
 
 	err := r.Data.Parse(text)
 	if err != nil {
-		return &ParseError{"", err.Error(), l}
+		return &ParseError{wrappedErr: err, lex: l}
 	}
 
 	return nil
diff --git a/scan.go b/scan.go
index 062d8ff3..1f92ae42 100644
--- a/scan.go
+++ b/scan.go
@@ -4,7 +4,9 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"io/fs"
 	"os"
+	"path"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -64,20 +66,26 @@ const (
 // ParseError is a parsing error. It contains the parse error and the location in the io.Reader
 // where the error occurred.
 type ParseError struct {
-	file string
-	err  string
-	lex  lex
+	file       string
+	err        string
+	wrappedErr error
+	lex        lex
 }
 
 func (e *ParseError) Error() (s string) {
 	if e.file != "" {
 		s = e.file + ": "
 	}
+	if e.err == "" && e.wrappedErr != nil {
+		e.err = e.wrappedErr.Error()
+	}
 	s += "dns: " + e.err + ": " + strconv.QuoteToASCII(e.lex.token) + " at line: " +
 		strconv.Itoa(e.lex.line) + ":" + strconv.Itoa(e.lex.column)
 	return
 }
 
+func (e *ParseError) Unwrap() error { return e.wrappedErr }
+
 type lex struct {
 	token  string // text of the token
 	err    bool   // when true, token text has lexer error
@@ -168,8 +176,9 @@ type ZoneParser struct {
 	// sub is used to parse $INCLUDE files and $GENERATE directives.
 	// Next, by calling subNext, forwards the resulting RRs from this
 	// sub parser to the calling code.
-	sub    *ZoneParser
-	osFile *os.File
+	sub  *ZoneParser
+	r    io.Reader
+	fsys fs.FS
 
 	includeDepth uint8
 
@@ -188,7 +197,7 @@ func NewZoneParser(r io.Reader, origin, file string) *ZoneParser {
 	if origin != "" {
 		origin = Fqdn(origin)
 		if _, ok := IsDomainName(origin); !ok {
-			pe = &ParseError{file, "bad initial origin name", lex{}}
+			pe = &ParseError{file: file, err: "bad initial origin name"}
 		}
 	}
 
@@ -220,6 +229,24 @@ func (zp *ZoneParser) SetIncludeAllowed(v bool) {
 	zp.includeAllowed = v
 }
 
+// SetIncludeFS provides an [fs.FS] to use when looking for the target of
+// $INCLUDE directives.  ($INCLUDE must still be enabled separately by calling
+// [ZoneParser.SetIncludeAllowed].)  If fsys is nil, [os.Open] will be used.
+//
+// When fsys is an on-disk FS, the ability of $INCLUDE to reach files from
+// outside its root directory depends upon the FS implementation.  For
+// instance, [os.DirFS] will refuse to open paths like "../../etc/passwd",
+// however it will still follow links which may point anywhere on the system.
+//
+// FS paths are slash-separated on all systems, even Windows.  $INCLUDE paths
+// containing other characters such as backslash and colon may be accepted as
+// valid, but those characters will never be interpreted by an FS
+// implementation as path element separators.  See [fs.ValidPath] for more
+// details.
+func (zp *ZoneParser) SetIncludeFS(fsys fs.FS) {
+	zp.fsys = fsys
+}
+
 // Err returns the first non-EOF error that was encountered by the
 // ZoneParser.
 func (zp *ZoneParser) Err() error {
@@ -237,7 +264,7 @@ func (zp *ZoneParser) Err() error {
 }
 
 func (zp *ZoneParser) setParseError(err string, l lex) (RR, bool) {
-	zp.parseErr = &ParseError{zp.file, err, l}
+	zp.parseErr = &ParseError{file: zp.file, err: err, lex: l}
 	return nil, false
 }
 
@@ -260,9 +287,11 @@ func (zp *ZoneParser) subNext() (RR, bool) {
 		return rr, true
 	}
 
-	if zp.sub.osFile != nil {
-		zp.sub.osFile.Close()
-		zp.sub.osFile = nil
+	if zp.sub.r != nil {
+		if c, ok := zp.sub.r.(io.Closer); ok {
+			c.Close()
+		}
+		zp.sub.r = nil
 	}
 
 	if zp.sub.Err() != nil {
@@ -402,24 +431,44 @@ func (zp *ZoneParser) Next() (RR, bool) {
 
 			// Start with the new file
 			includePath := l.token
-			if !filepath.IsAbs(includePath) {
-				includePath = filepath.Join(filepath.Dir(zp.file), includePath)
-			}
+			var r1 io.Reader
+			var e1 error
+			if zp.fsys != nil {
+				// fs.FS always uses / as separator, even on Windows, so use
+				// path instead of filepath here:
+				if !path.IsAbs(includePath) {
+					includePath = path.Join(path.Dir(zp.file), includePath)
+				}
+
+				// os.DirFS, and probably others, expect all paths to be
+				// relative, so clean the path and remove leading / if
+				// present:
+				includePath = strings.TrimLeft(path.Clean(includePath), "/")
 
-			r1, e1 := os.Open(includePath)
+				r1, e1 = zp.fsys.Open(includePath)
+			} else {
+				if !filepath.IsAbs(includePath) {
+					includePath = filepath.Join(filepath.Dir(zp.file), includePath)
+				}
+				r1, e1 = os.Open(includePath)
+			}
 			if e1 != nil {
 				var as string
-				if !filepath.IsAbs(l.token) {
+				if includePath != l.token {
 					as = fmt.Sprintf(" as `%s'", includePath)
 				}
-
-				msg := fmt.Sprintf("failed to open `%s'%s: %v", l.token, as, e1)
-				return zp.setParseError(msg, l)
+				zp.parseErr = &ParseError{
+					file:       zp.file,
+					wrappedErr: fmt.Errorf("failed to open `%s'%s: %w", l.token, as, e1),
+					lex:        l,
+				}
+				return nil, false
 			}
 
 			zp.sub = NewZoneParser(r1, neworigin, includePath)
-			zp.sub.defttl, zp.sub.includeDepth, zp.sub.osFile = zp.defttl, zp.includeDepth+1, r1
+			zp.sub.defttl, zp.sub.includeDepth, zp.sub.r = zp.defttl, zp.includeDepth+1, r1
 			zp.sub.SetIncludeAllowed(true)
+			zp.sub.SetIncludeFS(zp.fsys)
 			return zp.subNext()
 		case zExpectDirTTLBl:
 			if l.value != zBlank {
@@ -1326,12 +1375,12 @@ func slurpRemainder(c *zlexer) *ParseError {
 	case zBlank:
 		l, _ = c.Next()
 		if l.value != zNewline && l.value != zEOF {
-			return &ParseError{"", "garbage after rdata", l}
+			return &ParseError{err: "garbage after rdata", lex: l}
 		}
 	case zNewline:
 	case zEOF:
 	default:
-		return &ParseError{"", "garbage after rdata", l}
+		return &ParseError{err: "garbage after rdata", lex: l}
 	}
 	return nil
 }
@@ -1340,16 +1389,16 @@ func slurpRemainder(c *zlexer) *ParseError {
 // Used for NID and L64 record.
 func stringToNodeID(l lex) (uint64, *ParseError) {
 	if len(l.token) < 19 {
-		return 0, &ParseError{l.token, "bad NID/L64 NodeID/Locator64", l}
+		return 0, &ParseError{file: l.token, err: "bad NID/L64 NodeID/Locator64", lex: l}
 	}
 	// There must be three colons at fixes positions, if not its a parse error
 	if l.token[4] != ':' && l.token[9] != ':' && l.token[14] != ':' {
-		return 0, &ParseError{l.token, "bad NID/L64 NodeID/Locator64", l}
+		return 0, &ParseError{file: l.token, err: "bad NID/L64 NodeID/Locator64", lex: l}
 	}
 	s := l.token[0:4] + l.token[5:9] + l.token[10:14] + l.token[15:19]
 	u, err := strconv.ParseUint(s, 16, 64)
 	if err != nil {
-		return 0, &ParseError{l.token, "bad NID/L64 NodeID/Locator64", l}
+		return 0, &ParseError{file: l.token, err: "bad NID/L64 NodeID/Locator64", lex: l}
 	}
 	return u, nil
 }
diff --git a/scan_rr.go b/scan_rr.go
index a635e1c5..1a90c61f 100644
--- a/scan_rr.go
+++ b/scan_rr.go
@@ -3,6 +3,7 @@ package dns
 import (
 	"encoding/base64"
 	"errors"
+	"fmt"
 	"net"
 	"strconv"
 	"strings"
@@ -15,14 +16,14 @@ func endingToString(c *zlexer, errstr string) (string, *ParseError) {
 	l, _ := c.Next() // zString
 	for l.value != zNewline && l.value != zEOF {
 		if l.err {
-			return s.String(), &ParseError{"", errstr, l}
+			return s.String(), &ParseError{err: errstr, lex: l}
 		}
 		switch l.value {
 		case zString:
 			s.WriteString(l.token)
 		case zBlank: // Ok
 		default:
-			return "", &ParseError{"", errstr, l}
+			return "", &ParseError{err: errstr, lex: l}
 		}
 		l, _ = c.Next()
 	}
@@ -36,7 +37,7 @@ func endingToTxtSlice(c *zlexer, errstr string) ([]string, *ParseError) {
 	// Get the remaining data until we see a zNewline
 	l, _ := c.Next()
 	if l.err {
-		return nil, &ParseError{"", errstr, l}
+		return nil, &ParseError{err: errstr, lex: l}
 	}
 
 	// Build the slice
@@ -45,7 +46,7 @@ func endingToTxtSlice(c *zlexer, errstr string) ([]string, *ParseError) {
 	empty := false
 	for l.value != zNewline && l.value != zEOF {
 		if l.err {
-			return nil, &ParseError{"", errstr, l}
+			return nil, &ParseError{err: errstr, lex: l}
 		}
 		switch l.value {
 		case zString:
@@ -72,7 +73,7 @@ func endingToTxtSlice(c *zlexer, errstr string) ([]string, *ParseError) {
 		case zBlank:
 			if quote {
 				// zBlank can only be seen in between txt parts.
-				return nil, &ParseError{"", errstr, l}
+				return nil, &ParseError{err: errstr, lex: l}
 			}
 		case zQuote:
 			if empty && quote {
@@ -81,13 +82,13 @@ func endingToTxtSlice(c *zlexer, errstr string) ([]string, *ParseError) {
 			quote = !quote
 			empty = true
 		default:
-			return nil, &ParseError{"", errstr, l}
+			return nil, &ParseError{err: errstr, lex: l}
 		}
 		l, _ = c.Next()
 	}
 
 	if quote {
-		return nil, &ParseError{"", errstr, l}
+		return nil, &ParseError{err: errstr, lex: l}
 	}
 
 	return s, nil
@@ -102,7 +103,7 @@ func (rr *A) parse(c *zlexer, o string) *ParseError {
 	// IPv4.
 	isIPv4 := !strings.Contains(l.token, ":")
 	if rr.A == nil || !isIPv4 || l.err {
-		return &ParseError{"", "bad A A", l}
+		return &ParseError{err: "bad A A", lex: l}
 	}
 	return slurpRemainder(c)
 }
@@ -114,7 +115,7 @@ func (rr *AAAA) parse(c *zlexer, o string) *ParseError {
 	// addresses cannot include ":".
 	isIPv6 := strings.Contains(l.token, ":")
 	if rr.AAAA == nil || !isIPv6 || l.err {
-		return &ParseError{"", "bad AAAA AAAA", l}
+		return &ParseError{err: "bad AAAA AAAA", lex: l}
 	}
 	return slurpRemainder(c)
 }
@@ -123,7 +124,7 @@ func (rr *NS) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad NS Ns", l}
+		return &ParseError{err: "bad NS Ns", lex: l}
 	}
 	rr.Ns = name
 	return slurpRemainder(c)
@@ -133,7 +134,7 @@ func (rr *PTR) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad PTR Ptr", l}
+		return &ParseError{err: "bad PTR Ptr", lex: l}
 	}
 	rr.Ptr = name
 	return slurpRemainder(c)
@@ -143,7 +144,7 @@ func (rr *NSAPPTR) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad NSAP-PTR Ptr", l}
+		return &ParseError{err: "bad NSAP-PTR Ptr", lex: l}
 	}
 	rr.Ptr = name
 	return slurpRemainder(c)
@@ -153,7 +154,7 @@ func (rr *RP) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	mbox, mboxOk := toAbsoluteName(l.token, o)
 	if l.err || !mboxOk {
-		return &ParseError{"", "bad RP Mbox", l}
+		return &ParseError{err: "bad RP Mbox", lex: l}
 	}
 	rr.Mbox = mbox
 
@@ -163,7 +164,7 @@ func (rr *RP) parse(c *zlexer, o string) *ParseError {
 
 	txt, txtOk := toAbsoluteName(l.token, o)
 	if l.err || !txtOk {
-		return &ParseError{"", "bad RP Txt", l}
+		return &ParseError{err: "bad RP Txt", lex: l}
 	}
 	rr.Txt = txt
 
@@ -174,7 +175,7 @@ func (rr *MR) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad MR Mr", l}
+		return &ParseError{err: "bad MR Mr", lex: l}
 	}
 	rr.Mr = name
 	return slurpRemainder(c)
@@ -184,7 +185,7 @@ func (rr *MB) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad MB Mb", l}
+		return &ParseError{err: "bad MB Mb", lex: l}
 	}
 	rr.Mb = name
 	return slurpRemainder(c)
@@ -194,7 +195,7 @@ func (rr *MG) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad MG Mg", l}
+		return &ParseError{err: "bad MG Mg", lex: l}
 	}
 	rr.Mg = name
 	return slurpRemainder(c)
@@ -219,6 +220,29 @@ func (rr *HINFO) parse(c *zlexer, o string) *ParseError {
 
 	rr.Cpu = chunks[0]
 	rr.Os = strings.Join(chunks[1:], " ")
+	return nil
+}
+
+// according to RFC 1183 the parsing is identical to HINFO, so just use that code.
+func (rr *ISDN) parse(c *zlexer, o string) *ParseError {
+	chunks, e := endingToTxtSlice(c, "bad ISDN Fields")
+	if e != nil {
+		return e
+	}
+
+	if ln := len(chunks); ln == 0 {
+		return nil
+	} else if ln == 1 {
+		// Can we split it?
+		if out := strings.Fields(chunks[0]); len(out) > 1 {
+			chunks = out
+		} else {
+			chunks = append(chunks, "")
+		}
+	}
+
+	rr.Address = chunks[0]
+	rr.SubAddress = strings.Join(chunks[1:], " ")
 
 	return nil
 }
@@ -227,7 +251,7 @@ func (rr *MINFO) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	rmail, rmailOk := toAbsoluteName(l.token, o)
 	if l.err || !rmailOk {
-		return &ParseError{"", "bad MINFO Rmail", l}
+		return &ParseError{err: "bad MINFO Rmail", lex: l}
 	}
 	rr.Rmail = rmail
 
@@ -237,7 +261,7 @@ func (rr *MINFO) parse(c *zlexer, o string) *ParseError {
 
 	email, emailOk := toAbsoluteName(l.token, o)
 	if l.err || !emailOk {
-		return &ParseError{"", "bad MINFO Email", l}
+		return &ParseError{err: "bad MINFO Email", lex: l}
 	}
 	rr.Email = email
 
@@ -248,7 +272,7 @@ func (rr *MF) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad MF Mf", l}
+		return &ParseError{err: "bad MF Mf", lex: l}
 	}
 	rr.Mf = name
 	return slurpRemainder(c)
@@ -258,7 +282,7 @@ func (rr *MD) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad MD Md", l}
+		return &ParseError{err: "bad MD Md", lex: l}
 	}
 	rr.Md = name
 	return slurpRemainder(c)
@@ -268,7 +292,7 @@ func (rr *MX) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad MX Pref", l}
+		return &ParseError{err: "bad MX Pref", lex: l}
 	}
 	rr.Preference = uint16(i)
 
@@ -278,7 +302,7 @@ func (rr *MX) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad MX Mx", l}
+		return &ParseError{err: "bad MX Mx", lex: l}
 	}
 	rr.Mx = name
 
@@ -289,7 +313,7 @@ func (rr *RT) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil {
-		return &ParseError{"", "bad RT Preference", l}
+		return &ParseError{err: "bad RT Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 
@@ -299,7 +323,7 @@ func (rr *RT) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad RT Host", l}
+		return &ParseError{err: "bad RT Host", lex: l}
 	}
 	rr.Host = name
 
@@ -310,7 +334,7 @@ func (rr *AFSDB) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad AFSDB Subtype", l}
+		return &ParseError{err: "bad AFSDB Subtype", lex: l}
 	}
 	rr.Subtype = uint16(i)
 
@@ -320,7 +344,7 @@ func (rr *AFSDB) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad AFSDB Hostname", l}
+		return &ParseError{err: "bad AFSDB Hostname", lex: l}
 	}
 	rr.Hostname = name
 	return slurpRemainder(c)
@@ -329,7 +353,7 @@ func (rr *AFSDB) parse(c *zlexer, o string) *ParseError {
 func (rr *X25) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	if l.err {
-		return &ParseError{"", "bad X25 PSDNAddress", l}
+		return &ParseError{err: "bad X25 PSDNAddress", lex: l}
 	}
 	rr.PSDNAddress = l.token
 	return slurpRemainder(c)
@@ -339,7 +363,7 @@ func (rr *KX) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad KX Pref", l}
+		return &ParseError{err: "bad KX Pref", lex: l}
 	}
 	rr.Preference = uint16(i)
 
@@ -349,7 +373,7 @@ func (rr *KX) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad KX Exchanger", l}
+		return &ParseError{err: "bad KX Exchanger", lex: l}
 	}
 	rr.Exchanger = name
 	return slurpRemainder(c)
@@ -359,7 +383,7 @@ func (rr *CNAME) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad CNAME Target", l}
+		return &ParseError{err: "bad CNAME Target", lex: l}
 	}
 	rr.Target = name
 	return slurpRemainder(c)
@@ -369,7 +393,7 @@ func (rr *DNAME) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad DNAME Target", l}
+		return &ParseError{err: "bad DNAME Target", lex: l}
 	}
 	rr.Target = name
 	return slurpRemainder(c)
@@ -379,7 +403,7 @@ func (rr *SOA) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	ns, nsOk := toAbsoluteName(l.token, o)
 	if l.err || !nsOk {
-		return &ParseError{"", "bad SOA Ns", l}
+		return &ParseError{err: "bad SOA Ns", lex: l}
 	}
 	rr.Ns = ns
 
@@ -389,7 +413,7 @@ func (rr *SOA) parse(c *zlexer, o string) *ParseError {
 
 	mbox, mboxOk := toAbsoluteName(l.token, o)
 	if l.err || !mboxOk {
-		return &ParseError{"", "bad SOA Mbox", l}
+		return &ParseError{err: "bad SOA Mbox", lex: l}
 	}
 	rr.Mbox = mbox
 
@@ -402,16 +426,16 @@ func (rr *SOA) parse(c *zlexer, o string) *ParseError {
 	for i := 0; i < 5; i++ {
 		l, _ = c.Next()
 		if l.err {
-			return &ParseError{"", "bad SOA zone parameter", l}
+			return &ParseError{err: "bad SOA zone parameter", lex: l}
 		}
 		if j, err := strconv.ParseUint(l.token, 10, 32); err != nil {
 			if i == 0 {
 				// Serial must be a number
-				return &ParseError{"", "bad SOA zone parameter", l}
+				return &ParseError{err: "bad SOA zone parameter", lex: l}
 			}
 			// We allow other fields to be unitful duration strings
 			if v, ok = stringToTTL(l.token); !ok {
-				return &ParseError{"", "bad SOA zone parameter", l}
+				return &ParseError{err: "bad SOA zone parameter", lex: l}
 
 			}
 		} else {
@@ -441,7 +465,7 @@ func (rr *SRV) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad SRV Priority", l}
+		return &ParseError{err: "bad SRV Priority", lex: l}
 	}
 	rr.Priority = uint16(i)
 
@@ -449,7 +473,7 @@ func (rr *SRV) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next() // zString
 	i, e1 := strconv.ParseUint(l.token, 10, 16)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad SRV Weight", l}
+		return &ParseError{err: "bad SRV Weight", lex: l}
 	}
 	rr.Weight = uint16(i)
 
@@ -457,7 +481,7 @@ func (rr *SRV) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next() // zString
 	i, e2 := strconv.ParseUint(l.token, 10, 16)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad SRV Port", l}
+		return &ParseError{err: "bad SRV Port", lex: l}
 	}
 	rr.Port = uint16(i)
 
@@ -467,7 +491,7 @@ func (rr *SRV) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad SRV Target", l}
+		return &ParseError{err: "bad SRV Target", lex: l}
 	}
 	rr.Target = name
 	return slurpRemainder(c)
@@ -477,7 +501,7 @@ func (rr *NAPTR) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad NAPTR Order", l}
+		return &ParseError{err: "bad NAPTR Order", lex: l}
 	}
 	rr.Order = uint16(i)
 
@@ -485,7 +509,7 @@ func (rr *NAPTR) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next() // zString
 	i, e1 := strconv.ParseUint(l.token, 10, 16)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad NAPTR Preference", l}
+		return &ParseError{err: "bad NAPTR Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 
@@ -493,57 +517,57 @@ func (rr *NAPTR) parse(c *zlexer, o string) *ParseError {
 	c.Next()        // zBlank
 	l, _ = c.Next() // _QUOTE
 	if l.value != zQuote {
-		return &ParseError{"", "bad NAPTR Flags", l}
+		return &ParseError{err: "bad NAPTR Flags", lex: l}
 	}
 	l, _ = c.Next() // Either String or Quote
 	if l.value == zString {
 		rr.Flags = l.token
 		l, _ = c.Next() // _QUOTE
 		if l.value != zQuote {
-			return &ParseError{"", "bad NAPTR Flags", l}
+			return &ParseError{err: "bad NAPTR Flags", lex: l}
 		}
 	} else if l.value == zQuote {
 		rr.Flags = ""
 	} else {
-		return &ParseError{"", "bad NAPTR Flags", l}
+		return &ParseError{err: "bad NAPTR Flags", lex: l}
 	}
 
 	// Service
 	c.Next()        // zBlank
 	l, _ = c.Next() // _QUOTE
 	if l.value != zQuote {
-		return &ParseError{"", "bad NAPTR Service", l}
+		return &ParseError{err: "bad NAPTR Service", lex: l}
 	}
 	l, _ = c.Next() // Either String or Quote
 	if l.value == zString {
 		rr.Service = l.token
 		l, _ = c.Next() // _QUOTE
 		if l.value != zQuote {
-			return &ParseError{"", "bad NAPTR Service", l}
+			return &ParseError{err: "bad NAPTR Service", lex: l}
 		}
 	} else if l.value == zQuote {
 		rr.Service = ""
 	} else {
-		return &ParseError{"", "bad NAPTR Service", l}
+		return &ParseError{err: "bad NAPTR Service", lex: l}
 	}
 
 	// Regexp
 	c.Next()        // zBlank
 	l, _ = c.Next() // _QUOTE
 	if l.value != zQuote {
-		return &ParseError{"", "bad NAPTR Regexp", l}
+		return &ParseError{err: "bad NAPTR Regexp", lex: l}
 	}
 	l, _ = c.Next() // Either String or Quote
 	if l.value == zString {
 		rr.Regexp = l.token
 		l, _ = c.Next() // _QUOTE
 		if l.value != zQuote {
-			return &ParseError{"", "bad NAPTR Regexp", l}
+			return &ParseError{err: "bad NAPTR Regexp", lex: l}
 		}
 	} else if l.value == zQuote {
 		rr.Regexp = ""
 	} else {
-		return &ParseError{"", "bad NAPTR Regexp", l}
+		return &ParseError{err: "bad NAPTR Regexp", lex: l}
 	}
 
 	// After quote no space??
@@ -553,7 +577,7 @@ func (rr *NAPTR) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad NAPTR Replacement", l}
+		return &ParseError{err: "bad NAPTR Replacement", lex: l}
 	}
 	rr.Replacement = name
 	return slurpRemainder(c)
@@ -563,7 +587,7 @@ func (rr *TALINK) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	previousName, previousNameOk := toAbsoluteName(l.token, o)
 	if l.err || !previousNameOk {
-		return &ParseError{"", "bad TALINK PreviousName", l}
+		return &ParseError{err: "bad TALINK PreviousName", lex: l}
 	}
 	rr.PreviousName = previousName
 
@@ -573,7 +597,7 @@ func (rr *TALINK) parse(c *zlexer, o string) *ParseError {
 
 	nextName, nextNameOk := toAbsoluteName(l.token, o)
 	if l.err || !nextNameOk {
-		return &ParseError{"", "bad TALINK NextName", l}
+		return &ParseError{err: "bad TALINK NextName", lex: l}
 	}
 	rr.NextName = nextName
 
@@ -591,7 +615,7 @@ func (rr *LOC) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 32)
 	if e != nil || l.err || i > 90 {
-		return &ParseError{"", "bad LOC Latitude", l}
+		return &ParseError{err: "bad LOC Latitude", lex: l}
 	}
 	rr.Latitude = 1000 * 60 * 60 * uint32(i)
 
@@ -602,7 +626,7 @@ func (rr *LOC) parse(c *zlexer, o string) *ParseError {
 		goto East
 	}
 	if i, err := strconv.ParseUint(l.token, 10, 32); err != nil || l.err || i > 59 {
-		return &ParseError{"", "bad LOC Latitude minutes", l}
+		return &ParseError{err: "bad LOC Latitude minutes", lex: l}
 	} else {
 		rr.Latitude += 1000 * 60 * uint32(i)
 	}
@@ -610,7 +634,7 @@ func (rr *LOC) parse(c *zlexer, o string) *ParseError {
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if i, err := strconv.ParseFloat(l.token, 64); err != nil || l.err || i < 0 || i >= 60 {
-		return &ParseError{"", "bad LOC Latitude seconds", l}
+		return &ParseError{err: "bad LOC Latitude seconds", lex: l}
 	} else {
 		rr.Latitude += uint32(1000 * i)
 	}
@@ -621,14 +645,14 @@ func (rr *LOC) parse(c *zlexer, o string) *ParseError {
 		goto East
 	}
 	// If still alive, flag an error
-	return &ParseError{"", "bad LOC Latitude North/South", l}
+	return &ParseError{err: "bad LOC Latitude North/South", lex: l}
 
 East:
 	// East
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if i, err := strconv.ParseUint(l.token, 10, 32); err != nil || l.err || i > 180 {
-		return &ParseError{"", "bad LOC Longitude", l}
+		return &ParseError{err: "bad LOC Longitude", lex: l}
 	} else {
 		rr.Longitude = 1000 * 60 * 60 * uint32(i)
 	}
@@ -639,14 +663,14 @@ East:
 		goto Altitude
 	}
 	if i, err := strconv.ParseUint(l.token, 10, 32); err != nil || l.err || i > 59 {
-		return &ParseError{"", "bad LOC Longitude minutes", l}
+		return &ParseError{err: "bad LOC Longitude minutes", lex: l}
 	} else {
 		rr.Longitude += 1000 * 60 * uint32(i)
 	}
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if i, err := strconv.ParseFloat(l.token, 64); err != nil || l.err || i < 0 || i >= 60 {
-		return &ParseError{"", "bad LOC Longitude seconds", l}
+		return &ParseError{err: "bad LOC Longitude seconds", lex: l}
 	} else {
 		rr.Longitude += uint32(1000 * i)
 	}
@@ -657,19 +681,19 @@ East:
 		goto Altitude
 	}
 	// If still alive, flag an error
-	return &ParseError{"", "bad LOC Longitude East/West", l}
+	return &ParseError{err: "bad LOC Longitude East/West", lex: l}
 
 Altitude:
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if l.token == "" || l.err {
-		return &ParseError{"", "bad LOC Altitude", l}
+		return &ParseError{err: "bad LOC Altitude", lex: l}
 	}
 	if l.token[len(l.token)-1] == 'M' || l.token[len(l.token)-1] == 'm' {
 		l.token = l.token[0 : len(l.token)-1]
 	}
 	if i, err := strconv.ParseFloat(l.token, 64); err != nil {
-		return &ParseError{"", "bad LOC Altitude", l}
+		return &ParseError{err: "bad LOC Altitude", lex: l}
 	} else {
 		rr.Altitude = uint32(i*100.0 + 10000000.0 + 0.5)
 	}
@@ -684,19 +708,19 @@ Altitude:
 			case 0: // Size
 				exp, m, ok := stringToCm(l.token)
 				if !ok {
-					return &ParseError{"", "bad LOC Size", l}
+					return &ParseError{err: "bad LOC Size", lex: l}
 				}
 				rr.Size = exp&0x0f | m<<4&0xf0
 			case 1: // HorizPre
 				exp, m, ok := stringToCm(l.token)
 				if !ok {
-					return &ParseError{"", "bad LOC HorizPre", l}
+					return &ParseError{err: "bad LOC HorizPre", lex: l}
 				}
 				rr.HorizPre = exp&0x0f | m<<4&0xf0
 			case 2: // VertPre
 				exp, m, ok := stringToCm(l.token)
 				if !ok {
-					return &ParseError{"", "bad LOC VertPre", l}
+					return &ParseError{err: "bad LOC VertPre", lex: l}
 				}
 				rr.VertPre = exp&0x0f | m<<4&0xf0
 			}
@@ -704,7 +728,7 @@ Altitude:
 		case zBlank:
 			// Ok
 		default:
-			return &ParseError{"", "bad LOC Size, HorizPre or VertPre", l}
+			return &ParseError{err: "bad LOC Size, HorizPre or VertPre", lex: l}
 		}
 		l, _ = c.Next()
 	}
@@ -716,14 +740,14 @@ func (rr *HIP) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad HIP PublicKeyAlgorithm", l}
+		return &ParseError{err: "bad HIP PublicKeyAlgorithm", lex: l}
 	}
 	rr.PublicKeyAlgorithm = uint8(i)
 
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	if l.token == "" || l.err {
-		return &ParseError{"", "bad HIP Hit", l}
+		return &ParseError{err: "bad HIP Hit", lex: l}
 	}
 	rr.Hit = l.token // This can not contain spaces, see RFC 5205 Section 6.
 	rr.HitLength = uint8(len(rr.Hit)) / 2
@@ -731,12 +755,12 @@ func (rr *HIP) parse(c *zlexer, o string) *ParseError {
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	if l.token == "" || l.err {
-		return &ParseError{"", "bad HIP PublicKey", l}
+		return &ParseError{err: "bad HIP PublicKey", lex: l}
 	}
 	rr.PublicKey = l.token // This cannot contain spaces
 	decodedPK, decodedPKerr := base64.StdEncoding.DecodeString(rr.PublicKey)
 	if decodedPKerr != nil {
-		return &ParseError{"", "bad HIP PublicKey", l}
+		return &ParseError{err: "bad HIP PublicKey", lex: l}
 	}
 	rr.PublicKeyLength = uint16(len(decodedPK))
 
@@ -748,13 +772,13 @@ func (rr *HIP) parse(c *zlexer, o string) *ParseError {
 		case zString:
 			name, nameOk := toAbsoluteName(l.token, o)
 			if l.err || !nameOk {
-				return &ParseError{"", "bad HIP RendezvousServers", l}
+				return &ParseError{err: "bad HIP RendezvousServers", lex: l}
 			}
 			xs = append(xs, name)
 		case zBlank:
 			// Ok
 		default:
-			return &ParseError{"", "bad HIP RendezvousServers", l}
+			return &ParseError{err: "bad HIP RendezvousServers", lex: l}
 		}
 		l, _ = c.Next()
 	}
@@ -768,7 +792,7 @@ func (rr *CERT) parse(c *zlexer, o string) *ParseError {
 	if v, ok := StringToCertType[l.token]; ok {
 		rr.Type = v
 	} else if i, err := strconv.ParseUint(l.token, 10, 16); err != nil {
-		return &ParseError{"", "bad CERT Type", l}
+		return &ParseError{err: "bad CERT Type", lex: l}
 	} else {
 		rr.Type = uint16(i)
 	}
@@ -776,7 +800,7 @@ func (rr *CERT) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next() // zString
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad CERT KeyTag", l}
+		return &ParseError{err: "bad CERT KeyTag", lex: l}
 	}
 	rr.KeyTag = uint16(i)
 	c.Next()        // zBlank
@@ -784,7 +808,7 @@ func (rr *CERT) parse(c *zlexer, o string) *ParseError {
 	if v, ok := StringToAlgorithm[l.token]; ok {
 		rr.Algorithm = v
 	} else if i, err := strconv.ParseUint(l.token, 10, 8); err != nil {
-		return &ParseError{"", "bad CERT Algorithm", l}
+		return &ParseError{err: "bad CERT Algorithm", lex: l}
 	} else {
 		rr.Algorithm = uint8(i)
 	}
@@ -810,7 +834,7 @@ func (rr *CSYNC) parse(c *zlexer, o string) *ParseError {
 	j, e := strconv.ParseUint(l.token, 10, 32)
 	if e != nil {
 		// Serial must be a number
-		return &ParseError{"", "bad CSYNC serial", l}
+		return &ParseError{err: "bad CSYNC serial", lex: l}
 	}
 	rr.Serial = uint32(j)
 
@@ -820,7 +844,7 @@ func (rr *CSYNC) parse(c *zlexer, o string) *ParseError {
 	j, e1 := strconv.ParseUint(l.token, 10, 16)
 	if e1 != nil {
 		// Serial must be a number
-		return &ParseError{"", "bad CSYNC flags", l}
+		return &ParseError{err: "bad CSYNC flags", lex: l}
 	}
 	rr.Flags = uint16(j)
 
@@ -838,12 +862,12 @@ func (rr *CSYNC) parse(c *zlexer, o string) *ParseError {
 			tokenUpper := strings.ToUpper(l.token)
 			if k, ok = StringToType[tokenUpper]; !ok {
 				if k, ok = typeToInt(l.token); !ok {
-					return &ParseError{"", "bad CSYNC TypeBitMap", l}
+					return &ParseError{err: "bad CSYNC TypeBitMap", lex: l}
 				}
 			}
 			rr.TypeBitMap = append(rr.TypeBitMap, k)
 		default:
-			return &ParseError{"", "bad CSYNC TypeBitMap", l}
+			return &ParseError{err: "bad CSYNC TypeBitMap", lex: l}
 		}
 		l, _ = c.Next()
 	}
@@ -854,7 +878,7 @@ func (rr *ZONEMD) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 32)
 	if e != nil || l.err {
-		return &ParseError{"", "bad ZONEMD Serial", l}
+		return &ParseError{err: "bad ZONEMD Serial", lex: l}
 	}
 	rr.Serial = uint32(i)
 
@@ -862,7 +886,7 @@ func (rr *ZONEMD) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad ZONEMD Scheme", l}
+		return &ParseError{err: "bad ZONEMD Scheme", lex: l}
 	}
 	rr.Scheme = uint8(i)
 
@@ -870,7 +894,7 @@ func (rr *ZONEMD) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, err := strconv.ParseUint(l.token, 10, 8)
 	if err != nil || l.err {
-		return &ParseError{"", "bad ZONEMD Hash Algorithm", l}
+		return &ParseError{err: "bad ZONEMD Hash Algorithm", lex: l}
 	}
 	rr.Hash = uint8(i)
 
@@ -891,11 +915,11 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 		if strings.HasPrefix(tokenUpper, "TYPE") {
 			t, ok = typeToInt(l.token)
 			if !ok {
-				return &ParseError{"", "bad RRSIG Typecovered", l}
+				return &ParseError{err: "bad RRSIG Typecovered", lex: l}
 			}
 			rr.TypeCovered = t
 		} else {
-			return &ParseError{"", "bad RRSIG Typecovered", l}
+			return &ParseError{err: "bad RRSIG Typecovered", lex: l}
 		}
 	} else {
 		rr.TypeCovered = t
@@ -904,14 +928,14 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if l.err {
-		return &ParseError{"", "bad RRSIG Algorithm", l}
+		return &ParseError{err: "bad RRSIG Algorithm", lex: l}
 	}
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	rr.Algorithm = uint8(i) // if 0 we'll check the mnemonic in the if
 	if e != nil {
 		v, ok := StringToAlgorithm[l.token]
 		if !ok {
-			return &ParseError{"", "bad RRSIG Algorithm", l}
+			return &ParseError{err: "bad RRSIG Algorithm", lex: l}
 		}
 		rr.Algorithm = v
 	}
@@ -920,7 +944,7 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad RRSIG Labels", l}
+		return &ParseError{err: "bad RRSIG Labels", lex: l}
 	}
 	rr.Labels = uint8(i)
 
@@ -928,7 +952,7 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e2 := strconv.ParseUint(l.token, 10, 32)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad RRSIG OrigTtl", l}
+		return &ParseError{err: "bad RRSIG OrigTtl", lex: l}
 	}
 	rr.OrigTtl = uint32(i)
 
@@ -939,7 +963,7 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 		if i, err := strconv.ParseUint(l.token, 10, 32); err == nil {
 			rr.Expiration = uint32(i)
 		} else {
-			return &ParseError{"", "bad RRSIG Expiration", l}
+			return &ParseError{err: "bad RRSIG Expiration", lex: l}
 		}
 	} else {
 		rr.Expiration = i
@@ -951,7 +975,7 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 		if i, err := strconv.ParseUint(l.token, 10, 32); err == nil {
 			rr.Inception = uint32(i)
 		} else {
-			return &ParseError{"", "bad RRSIG Inception", l}
+			return &ParseError{err: "bad RRSIG Inception", lex: l}
 		}
 	} else {
 		rr.Inception = i
@@ -961,7 +985,7 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e3 := strconv.ParseUint(l.token, 10, 16)
 	if e3 != nil || l.err {
-		return &ParseError{"", "bad RRSIG KeyTag", l}
+		return &ParseError{err: "bad RRSIG KeyTag", lex: l}
 	}
 	rr.KeyTag = uint16(i)
 
@@ -970,7 +994,7 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 	rr.SignerName = l.token
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad RRSIG SignerName", l}
+		return &ParseError{err: "bad RRSIG SignerName", lex: l}
 	}
 	rr.SignerName = name
 
@@ -983,11 +1007,13 @@ func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
 	return nil
 }
 
+func (rr *NXT) parse(c *zlexer, o string) *ParseError { return rr.NSEC.parse(c, o) }
+
 func (rr *NSEC) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad NSEC NextDomain", l}
+		return &ParseError{err: "bad NSEC NextDomain", lex: l}
 	}
 	rr.NextDomain = name
 
@@ -1005,12 +1031,12 @@ func (rr *NSEC) parse(c *zlexer, o string) *ParseError {
 			tokenUpper := strings.ToUpper(l.token)
 			if k, ok = StringToType[tokenUpper]; !ok {
 				if k, ok = typeToInt(l.token); !ok {
-					return &ParseError{"", "bad NSEC TypeBitMap", l}
+					return &ParseError{err: "bad NSEC TypeBitMap", lex: l}
 				}
 			}
 			rr.TypeBitMap = append(rr.TypeBitMap, k)
 		default:
-			return &ParseError{"", "bad NSEC TypeBitMap", l}
+			return &ParseError{err: "bad NSEC TypeBitMap", lex: l}
 		}
 		l, _ = c.Next()
 	}
@@ -1021,27 +1047,27 @@ func (rr *NSEC3) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad NSEC3 Hash", l}
+		return &ParseError{err: "bad NSEC3 Hash", lex: l}
 	}
 	rr.Hash = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad NSEC3 Flags", l}
+		return &ParseError{err: "bad NSEC3 Flags", lex: l}
 	}
 	rr.Flags = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e2 := strconv.ParseUint(l.token, 10, 16)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad NSEC3 Iterations", l}
+		return &ParseError{err: "bad NSEC3 Iterations", lex: l}
 	}
 	rr.Iterations = uint16(i)
 	c.Next()
 	l, _ = c.Next()
 	if l.token == "" || l.err {
-		return &ParseError{"", "bad NSEC3 Salt", l}
+		return &ParseError{err: "bad NSEC3 Salt", lex: l}
 	}
 	if l.token != "-" {
 		rr.SaltLength = uint8(len(l.token)) / 2
@@ -1051,7 +1077,7 @@ func (rr *NSEC3) parse(c *zlexer, o string) *ParseError {
 	c.Next()
 	l, _ = c.Next()
 	if l.token == "" || l.err {
-		return &ParseError{"", "bad NSEC3 NextDomain", l}
+		return &ParseError{err: "bad NSEC3 NextDomain", lex: l}
 	}
 	rr.HashLength = 20 // Fix for NSEC3 (sha1 160 bits)
 	rr.NextDomain = l.token
@@ -1070,12 +1096,12 @@ func (rr *NSEC3) parse(c *zlexer, o string) *ParseError {
 			tokenUpper := strings.ToUpper(l.token)
 			if k, ok = StringToType[tokenUpper]; !ok {
 				if k, ok = typeToInt(l.token); !ok {
-					return &ParseError{"", "bad NSEC3 TypeBitMap", l}
+					return &ParseError{err: "bad NSEC3 TypeBitMap", lex: l}
 				}
 			}
 			rr.TypeBitMap = append(rr.TypeBitMap, k)
 		default:
-			return &ParseError{"", "bad NSEC3 TypeBitMap", l}
+			return &ParseError{err: "bad NSEC3 TypeBitMap", lex: l}
 		}
 		l, _ = c.Next()
 	}
@@ -1086,21 +1112,21 @@ func (rr *NSEC3PARAM) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad NSEC3PARAM Hash", l}
+		return &ParseError{err: "bad NSEC3PARAM Hash", lex: l}
 	}
 	rr.Hash = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad NSEC3PARAM Flags", l}
+		return &ParseError{err: "bad NSEC3PARAM Flags", lex: l}
 	}
 	rr.Flags = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e2 := strconv.ParseUint(l.token, 10, 16)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad NSEC3PARAM Iterations", l}
+		return &ParseError{err: "bad NSEC3PARAM Iterations", lex: l}
 	}
 	rr.Iterations = uint16(i)
 	c.Next()
@@ -1115,7 +1141,7 @@ func (rr *NSEC3PARAM) parse(c *zlexer, o string) *ParseError {
 func (rr *EUI48) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	if len(l.token) != 17 || l.err {
-		return &ParseError{"", "bad EUI48 Address", l}
+		return &ParseError{err: "bad EUI48 Address", lex: l}
 	}
 	addr := make([]byte, 12)
 	dash := 0
@@ -1124,7 +1150,7 @@ func (rr *EUI48) parse(c *zlexer, o string) *ParseError {
 		addr[i+1] = l.token[i+1+dash]
 		dash++
 		if l.token[i+1+dash] != '-' {
-			return &ParseError{"", "bad EUI48 Address", l}
+			return &ParseError{err: "bad EUI48 Address", lex: l}
 		}
 	}
 	addr[10] = l.token[15]
@@ -1132,7 +1158,7 @@ func (rr *EUI48) parse(c *zlexer, o string) *ParseError {
 
 	i, e := strconv.ParseUint(string(addr), 16, 48)
 	if e != nil {
-		return &ParseError{"", "bad EUI48 Address", l}
+		return &ParseError{err: "bad EUI48 Address", lex: l}
 	}
 	rr.Address = i
 	return slurpRemainder(c)
@@ -1141,7 +1167,7 @@ func (rr *EUI48) parse(c *zlexer, o string) *ParseError {
 func (rr *EUI64) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	if len(l.token) != 23 || l.err {
-		return &ParseError{"", "bad EUI64 Address", l}
+		return &ParseError{err: "bad EUI64 Address", lex: l}
 	}
 	addr := make([]byte, 16)
 	dash := 0
@@ -1150,7 +1176,7 @@ func (rr *EUI64) parse(c *zlexer, o string) *ParseError {
 		addr[i+1] = l.token[i+1+dash]
 		dash++
 		if l.token[i+1+dash] != '-' {
-			return &ParseError{"", "bad EUI64 Address", l}
+			return &ParseError{err: "bad EUI64 Address", lex: l}
 		}
 	}
 	addr[14] = l.token[21]
@@ -1158,7 +1184,7 @@ func (rr *EUI64) parse(c *zlexer, o string) *ParseError {
 
 	i, e := strconv.ParseUint(string(addr), 16, 64)
 	if e != nil {
-		return &ParseError{"", "bad EUI68 Address", l}
+		return &ParseError{err: "bad EUI68 Address", lex: l}
 	}
 	rr.Address = i
 	return slurpRemainder(c)
@@ -1168,14 +1194,14 @@ func (rr *SSHFP) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad SSHFP Algorithm", l}
+		return &ParseError{err: "bad SSHFP Algorithm", lex: l}
 	}
 	rr.Algorithm = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad SSHFP Type", l}
+		return &ParseError{err: "bad SSHFP Type", lex: l}
 	}
 	rr.Type = uint8(i)
 	c.Next() // zBlank
@@ -1191,21 +1217,21 @@ func (rr *DNSKEY) parseDNSKEY(c *zlexer, o, typ string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad " + typ + " Flags", l}
+		return &ParseError{err: "bad " + typ + " Flags", lex: l}
 	}
 	rr.Flags = uint16(i)
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad " + typ + " Protocol", l}
+		return &ParseError{err: "bad " + typ + " Protocol", lex: l}
 	}
 	rr.Protocol = uint8(i)
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	i, e2 := strconv.ParseUint(l.token, 10, 8)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad " + typ + " Algorithm", l}
+		return &ParseError{err: "bad " + typ + " Algorithm", lex: l}
 	}
 	rr.Algorithm = uint8(i)
 	s, e3 := endingToString(c, "bad "+typ+" PublicKey")
@@ -1227,7 +1253,7 @@ func (rr *IPSECKEY) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	num, err := strconv.ParseUint(l.token, 10, 8)
 	if err != nil || l.err {
-		return &ParseError{"", "bad IPSECKEY value", l}
+		return &ParseError{err: "bad IPSECKEY value", lex: l}
 	}
 	rr.Precedence = uint8(num)
 	c.Next() // zBlank
@@ -1235,7 +1261,7 @@ func (rr *IPSECKEY) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	num, err = strconv.ParseUint(l.token, 10, 8)
 	if err != nil || l.err {
-		return &ParseError{"", "bad IPSECKEY value", l}
+		return &ParseError{err: "bad IPSECKEY value", lex: l}
 	}
 	rr.GatewayType = uint8(num)
 	c.Next() // zBlank
@@ -1243,19 +1269,19 @@ func (rr *IPSECKEY) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	num, err = strconv.ParseUint(l.token, 10, 8)
 	if err != nil || l.err {
-		return &ParseError{"", "bad IPSECKEY value", l}
+		return &ParseError{err: "bad IPSECKEY value", lex: l}
 	}
 	rr.Algorithm = uint8(num)
 	c.Next() // zBlank
 
 	l, _ = c.Next()
 	if l.err {
-		return &ParseError{"", "bad IPSECKEY gateway", l}
+		return &ParseError{err: "bad IPSECKEY gateway", lex: l}
 	}
 
 	rr.GatewayAddr, rr.GatewayHost, err = parseAddrHostUnion(l.token, o, rr.GatewayType)
 	if err != nil {
-		return &ParseError{"", "IPSECKEY " + err.Error(), l}
+		return &ParseError{wrappedErr: fmt.Errorf("IPSECKEY %w", err), lex: l}
 	}
 
 	c.Next() // zBlank
@@ -1272,14 +1298,14 @@ func (rr *AMTRELAY) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	num, err := strconv.ParseUint(l.token, 10, 8)
 	if err != nil || l.err {
-		return &ParseError{"", "bad AMTRELAY value", l}
+		return &ParseError{err: "bad AMTRELAY value", lex: l}
 	}
 	rr.Precedence = uint8(num)
 	c.Next() // zBlank
 
 	l, _ = c.Next()
 	if l.err || !(l.token == "0" || l.token == "1") {
-		return &ParseError{"", "bad discovery value", l}
+		return &ParseError{err: "bad discovery value", lex: l}
 	}
 	if l.token == "1" {
 		rr.GatewayType = 0x80
@@ -1290,19 +1316,19 @@ func (rr *AMTRELAY) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	num, err = strconv.ParseUint(l.token, 10, 8)
 	if err != nil || l.err {
-		return &ParseError{"", "bad AMTRELAY value", l}
+		return &ParseError{err: "bad AMTRELAY value", lex: l}
 	}
 	rr.GatewayType |= uint8(num)
 	c.Next() // zBlank
 
 	l, _ = c.Next()
 	if l.err {
-		return &ParseError{"", "bad AMTRELAY gateway", l}
+		return &ParseError{err: "bad AMTRELAY gateway", lex: l}
 	}
 
 	rr.GatewayAddr, rr.GatewayHost, err = parseAddrHostUnion(l.token, o, rr.GatewayType&0x7f)
 	if err != nil {
-		return &ParseError{"", "AMTRELAY " + err.Error(), l}
+		return &ParseError{wrappedErr: fmt.Errorf("AMTRELAY %w", err), lex: l}
 	}
 
 	return slurpRemainder(c)
@@ -1338,21 +1364,21 @@ func (rr *RKEY) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad RKEY Flags", l}
+		return &ParseError{err: "bad RKEY Flags", lex: l}
 	}
 	rr.Flags = uint16(i)
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad RKEY Protocol", l}
+		return &ParseError{err: "bad RKEY Protocol", lex: l}
 	}
 	rr.Protocol = uint8(i)
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	i, e2 := strconv.ParseUint(l.token, 10, 8)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad RKEY Algorithm", l}
+		return &ParseError{err: "bad RKEY Algorithm", lex: l}
 	}
 	rr.Algorithm = uint8(i)
 	s, e3 := endingToString(c, "bad RKEY PublicKey")
@@ -1385,21 +1411,21 @@ func (rr *GPOS) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	_, e := strconv.ParseFloat(l.token, 64)
 	if e != nil || l.err {
-		return &ParseError{"", "bad GPOS Longitude", l}
+		return &ParseError{err: "bad GPOS Longitude", lex: l}
 	}
 	rr.Longitude = l.token
 	c.Next() // zBlank
 	l, _ = c.Next()
 	_, e1 := strconv.ParseFloat(l.token, 64)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad GPOS Latitude", l}
+		return &ParseError{err: "bad GPOS Latitude", lex: l}
 	}
 	rr.Latitude = l.token
 	c.Next() // zBlank
 	l, _ = c.Next()
 	_, e2 := strconv.ParseFloat(l.token, 64)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad GPOS Altitude", l}
+		return &ParseError{err: "bad GPOS Altitude", lex: l}
 	}
 	rr.Altitude = l.token
 	return slurpRemainder(c)
@@ -1409,7 +1435,7 @@ func (rr *DS) parseDS(c *zlexer, o, typ string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad " + typ + " KeyTag", l}
+		return &ParseError{err: "bad " + typ + " KeyTag", lex: l}
 	}
 	rr.KeyTag = uint16(i)
 	c.Next() // zBlank
@@ -1418,7 +1444,7 @@ func (rr *DS) parseDS(c *zlexer, o, typ string) *ParseError {
 		tokenUpper := strings.ToUpper(l.token)
 		i, ok := StringToAlgorithm[tokenUpper]
 		if !ok || l.err {
-			return &ParseError{"", "bad " + typ + " Algorithm", l}
+			return &ParseError{err: "bad " + typ + " Algorithm", lex: l}
 		}
 		rr.Algorithm = i
 	} else {
@@ -1428,7 +1454,7 @@ func (rr *DS) parseDS(c *zlexer, o, typ string) *ParseError {
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad " + typ + " DigestType", l}
+		return &ParseError{err: "bad " + typ + " DigestType", lex: l}
 	}
 	rr.DigestType = uint8(i)
 	s, e2 := endingToString(c, "bad "+typ+" Digest")
@@ -1443,7 +1469,7 @@ func (rr *TA) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad TA KeyTag", l}
+		return &ParseError{err: "bad TA KeyTag", lex: l}
 	}
 	rr.KeyTag = uint16(i)
 	c.Next() // zBlank
@@ -1452,7 +1478,7 @@ func (rr *TA) parse(c *zlexer, o string) *ParseError {
 		tokenUpper := strings.ToUpper(l.token)
 		i, ok := StringToAlgorithm[tokenUpper]
 		if !ok || l.err {
-			return &ParseError{"", "bad TA Algorithm", l}
+			return &ParseError{err: "bad TA Algorithm", lex: l}
 		}
 		rr.Algorithm = i
 	} else {
@@ -1462,7 +1488,7 @@ func (rr *TA) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad TA DigestType", l}
+		return &ParseError{err: "bad TA DigestType", lex: l}
 	}
 	rr.DigestType = uint8(i)
 	s, e2 := endingToString(c, "bad TA Digest")
@@ -1477,21 +1503,21 @@ func (rr *TLSA) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad TLSA Usage", l}
+		return &ParseError{err: "bad TLSA Usage", lex: l}
 	}
 	rr.Usage = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad TLSA Selector", l}
+		return &ParseError{err: "bad TLSA Selector", lex: l}
 	}
 	rr.Selector = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e2 := strconv.ParseUint(l.token, 10, 8)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad TLSA MatchingType", l}
+		return &ParseError{err: "bad TLSA MatchingType", lex: l}
 	}
 	rr.MatchingType = uint8(i)
 	// So this needs be e2 (i.e. different than e), because...??t
@@ -1507,21 +1533,21 @@ func (rr *SMIMEA) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad SMIMEA Usage", l}
+		return &ParseError{err: "bad SMIMEA Usage", lex: l}
 	}
 	rr.Usage = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad SMIMEA Selector", l}
+		return &ParseError{err: "bad SMIMEA Selector", lex: l}
 	}
 	rr.Selector = uint8(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e2 := strconv.ParseUint(l.token, 10, 8)
 	if e2 != nil || l.err {
-		return &ParseError{"", "bad SMIMEA MatchingType", l}
+		return &ParseError{err: "bad SMIMEA MatchingType", lex: l}
 	}
 	rr.MatchingType = uint8(i)
 	// So this needs be e2 (i.e. different than e), because...??t
@@ -1536,14 +1562,14 @@ func (rr *SMIMEA) parse(c *zlexer, o string) *ParseError {
 func (rr *RFC3597) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	if l.token != "\\#" {
-		return &ParseError{"", "bad RFC3597 Rdata", l}
+		return &ParseError{err: "bad RFC3597 Rdata", lex: l}
 	}
 
 	c.Next() // zBlank
 	l, _ = c.Next()
 	rdlength, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad RFC3597 Rdata ", l}
+		return &ParseError{err: "bad RFC3597 Rdata ", lex: l}
 	}
 
 	s, e1 := endingToString(c, "bad RFC3597 Rdata")
@@ -1551,7 +1577,7 @@ func (rr *RFC3597) parse(c *zlexer, o string) *ParseError {
 		return e1
 	}
 	if int(rdlength)*2 != len(s) {
-		return &ParseError{"", "bad RFC3597 Rdata", l}
+		return &ParseError{err: "bad RFC3597 Rdata", lex: l}
 	}
 	rr.Rdata = s
 	return nil
@@ -1599,14 +1625,14 @@ func (rr *URI) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad URI Priority", l}
+		return &ParseError{err: "bad URI Priority", lex: l}
 	}
 	rr.Priority = uint16(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 16)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad URI Weight", l}
+		return &ParseError{err: "bad URI Weight", lex: l}
 	}
 	rr.Weight = uint16(i)
 
@@ -1616,7 +1642,7 @@ func (rr *URI) parse(c *zlexer, o string) *ParseError {
 		return e2
 	}
 	if len(s) != 1 {
-		return &ParseError{"", "bad URI Target", l}
+		return &ParseError{err: "bad URI Target", lex: l}
 	}
 	rr.Target = s[0]
 	return nil
@@ -1636,7 +1662,7 @@ func (rr *NID) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad NID Preference", l}
+		return &ParseError{err: "bad NID Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 	c.Next()        // zBlank
@@ -1653,14 +1679,14 @@ func (rr *L32) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad L32 Preference", l}
+		return &ParseError{err: "bad L32 Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	rr.Locator32 = net.ParseIP(l.token)
 	if rr.Locator32 == nil || l.err {
-		return &ParseError{"", "bad L32 Locator", l}
+		return &ParseError{err: "bad L32 Locator", lex: l}
 	}
 	return slurpRemainder(c)
 }
@@ -1669,7 +1695,7 @@ func (rr *LP) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad LP Preference", l}
+		return &ParseError{err: "bad LP Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 
@@ -1678,7 +1704,7 @@ func (rr *LP) parse(c *zlexer, o string) *ParseError {
 	rr.Fqdn = l.token
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{"", "bad LP Fqdn", l}
+		return &ParseError{err: "bad LP Fqdn", lex: l}
 	}
 	rr.Fqdn = name
 	return slurpRemainder(c)
@@ -1688,7 +1714,7 @@ func (rr *L64) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad L64 Preference", l}
+		return &ParseError{err: "bad L64 Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 	c.Next()        // zBlank
@@ -1705,7 +1731,7 @@ func (rr *UID) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 32)
 	if e != nil || l.err {
-		return &ParseError{"", "bad UID Uid", l}
+		return &ParseError{err: "bad UID Uid", lex: l}
 	}
 	rr.Uid = uint32(i)
 	return slurpRemainder(c)
@@ -1715,7 +1741,7 @@ func (rr *GID) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 32)
 	if e != nil || l.err {
-		return &ParseError{"", "bad GID Gid", l}
+		return &ParseError{err: "bad GID Gid", lex: l}
 	}
 	rr.Gid = uint32(i)
 	return slurpRemainder(c)
@@ -1737,7 +1763,7 @@ func (rr *PX) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{"", "bad PX Preference", l}
+		return &ParseError{err: "bad PX Preference", lex: l}
 	}
 	rr.Preference = uint16(i)
 
@@ -1746,7 +1772,7 @@ func (rr *PX) parse(c *zlexer, o string) *ParseError {
 	rr.Map822 = l.token
 	map822, map822Ok := toAbsoluteName(l.token, o)
 	if l.err || !map822Ok {
-		return &ParseError{"", "bad PX Map822", l}
+		return &ParseError{err: "bad PX Map822", lex: l}
 	}
 	rr.Map822 = map822
 
@@ -1755,7 +1781,7 @@ func (rr *PX) parse(c *zlexer, o string) *ParseError {
 	rr.Mapx400 = l.token
 	mapx400, mapx400Ok := toAbsoluteName(l.token, o)
 	if l.err || !mapx400Ok {
-		return &ParseError{"", "bad PX Mapx400", l}
+		return &ParseError{err: "bad PX Mapx400", lex: l}
 	}
 	rr.Mapx400 = mapx400
 	return slurpRemainder(c)
@@ -1765,14 +1791,14 @@ func (rr *CAA) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad CAA Flag", l}
+		return &ParseError{err: "bad CAA Flag", lex: l}
 	}
 	rr.Flag = uint8(i)
 
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
 	if l.value != zString {
-		return &ParseError{"", "bad CAA Tag", l}
+		return &ParseError{err: "bad CAA Tag", lex: l}
 	}
 	rr.Tag = l.token
 
@@ -1782,7 +1808,7 @@ func (rr *CAA) parse(c *zlexer, o string) *ParseError {
 		return e1
 	}
 	if len(s) != 1 {
-		return &ParseError{"", "bad CAA Value", l}
+		return &ParseError{err: "bad CAA Value", lex: l}
 	}
 	rr.Value = s[0]
 	return nil
@@ -1793,7 +1819,7 @@ func (rr *TKEY) parse(c *zlexer, o string) *ParseError {
 
 	// Algorithm
 	if l.value != zString {
-		return &ParseError{"", "bad TKEY algorithm", l}
+		return &ParseError{err: "bad TKEY algorithm", lex: l}
 	}
 	rr.Algorithm = l.token
 	c.Next() // zBlank
@@ -1802,13 +1828,13 @@ func (rr *TKEY) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 8)
 	if e != nil || l.err {
-		return &ParseError{"", "bad TKEY key length", l}
+		return &ParseError{err: "bad TKEY key length", lex: l}
 	}
 	rr.KeySize = uint16(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if l.value != zString {
-		return &ParseError{"", "bad TKEY key", l}
+		return &ParseError{err: "bad TKEY key", lex: l}
 	}
 	rr.Key = l.token
 	c.Next() // zBlank
@@ -1817,13 +1843,13 @@ func (rr *TKEY) parse(c *zlexer, o string) *ParseError {
 	l, _ = c.Next()
 	i, e1 := strconv.ParseUint(l.token, 10, 8)
 	if e1 != nil || l.err {
-		return &ParseError{"", "bad TKEY otherdata length", l}
+		return &ParseError{err: "bad TKEY otherdata length", lex: l}
 	}
 	rr.OtherLen = uint16(i)
 	c.Next() // zBlank
 	l, _ = c.Next()
 	if l.value != zString {
-		return &ParseError{"", "bad TKEY otherday", l}
+		return &ParseError{err: "bad TKEY otherday", lex: l}
 	}
 	rr.OtherData = l.token
 	return nil
@@ -1841,14 +1867,14 @@ func (rr *APL) parse(c *zlexer, o string) *ParseError {
 			continue
 		}
 		if l.value != zString {
-			return &ParseError{"", "unexpected APL field", l}
+			return &ParseError{err: "unexpected APL field", lex: l}
 		}
 
 		// Expected format: [!]afi:address/prefix
 
 		colon := strings.IndexByte(l.token, ':')
 		if colon == -1 {
-			return &ParseError{"", "missing colon in APL field", l}
+			return &ParseError{err: "missing colon in APL field", lex: l}
 		}
 
 		family, cidr := l.token[:colon], l.token[colon+1:]
@@ -1861,7 +1887,7 @@ func (rr *APL) parse(c *zlexer, o string) *ParseError {
 
 		afi, e := strconv.ParseUint(family, 10, 16)
 		if e != nil {
-			return &ParseError{"", "failed to parse APL family: " + e.Error(), l}
+			return &ParseError{wrappedErr: fmt.Errorf("failed to parse APL family: %w", e), lex: l}
 		}
 		var addrLen int
 		switch afi {
@@ -1870,19 +1896,19 @@ func (rr *APL) parse(c *zlexer, o string) *ParseError {
 		case 2:
 			addrLen = net.IPv6len
 		default:
-			return &ParseError{"", "unrecognized APL family", l}
+			return &ParseError{err: "unrecognized APL family", lex: l}
 		}
 
 		ip, subnet, e1 := net.ParseCIDR(cidr)
 		if e1 != nil {
-			return &ParseError{"", "failed to parse APL address: " + e1.Error(), l}
+			return &ParseError{wrappedErr: fmt.Errorf("failed to parse APL address: %w", e1), lex: l}
 		}
 		if !ip.Equal(subnet.IP) {
-			return &ParseError{"", "extra bits in APL address", l}
+			return &ParseError{err: "extra bits in APL address", lex: l}
 		}
 
 		if len(subnet.IP) != addrLen {
-			return &ParseError{"", "address mismatch with the APL family", l}
+			return &ParseError{err: "address mismatch with the APL family", lex: l}
 		}
 
 		prefixes = append(prefixes, APLPrefix{
diff --git a/svcb.go b/svcb.go
index d38aa2f0..c1a740b6 100644
--- a/svcb.go
+++ b/svcb.go
@@ -85,7 +85,7 @@ func (rr *SVCB) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)
 	if e != nil || l.err {
-		return &ParseError{l.token, "bad SVCB priority", l}
+		return &ParseError{file: l.token, err: "bad SVCB priority", lex: l}
 	}
 	rr.Priority = uint16(i)
 
@@ -95,7 +95,7 @@ func (rr *SVCB) parse(c *zlexer, o string) *ParseError {
 
 	name, nameOk := toAbsoluteName(l.token, o)
 	if l.err || !nameOk {
-		return &ParseError{l.token, "bad SVCB Target", l}
+		return &ParseError{file: l.token, err: "bad SVCB Target", lex: l}
 	}
 	rr.Target = name
 
@@ -111,7 +111,7 @@ func (rr *SVCB) parse(c *zlexer, o string) *ParseError {
 			if !canHaveNextKey {
 				// The key we can now read was probably meant to be
 				// a part of the last value.
-				return &ParseError{l.token, "bad SVCB value quotation", l}
+				return &ParseError{file: l.token, err: "bad SVCB value quotation", lex: l}
 			}
 
 			// In key=value pairs, value does not have to be quoted unless value
@@ -124,7 +124,7 @@ func (rr *SVCB) parse(c *zlexer, o string) *ParseError {
 				// Key with no value and no equality sign
 				key = l.token
 			} else if idx == 0 {
-				return &ParseError{l.token, "bad SVCB key", l}
+				return &ParseError{file: l.token, err: "bad SVCB key", lex: l}
 			} else {
 				key, value = l.token[:idx], l.token[idx+1:]
 
@@ -144,30 +144,30 @@ func (rr *SVCB) parse(c *zlexer, o string) *ParseError {
 							value = l.token
 							l, _ = c.Next()
 							if l.value != zQuote {
-								return &ParseError{l.token, "SVCB unterminated value", l}
+								return &ParseError{file: l.token, err: "SVCB unterminated value", lex: l}
 							}
 						case zQuote:
 							// There's nothing in double quotes.
 						default:
-							return &ParseError{l.token, "bad SVCB value", l}
+							return &ParseError{file: l.token, err: "bad SVCB value", lex: l}
 						}
 					}
 				}
 			}
 			kv := makeSVCBKeyValue(svcbStringToKey(key))
 			if kv == nil {
-				return &ParseError{l.token, "bad SVCB key", l}
+				return &ParseError{file: l.token, err: "bad SVCB key", lex: l}
 			}
 			if err := kv.parse(value); err != nil {
-				return &ParseError{l.token, err.Error(), l}
+				return &ParseError{file: l.token, wrappedErr: err, lex: l}
 			}
 			xs = append(xs, kv)
 		case zQuote:
-			return &ParseError{l.token, "SVCB key can't contain double quotes", l}
+			return &ParseError{file: l.token, err: "SVCB key can't contain double quotes", lex: l}
 		case zBlank:
 			canHaveNextKey = true
 		default:
-			return &ParseError{l.token, "bad SVCB values", l}
+			return &ParseError{file: l.token, err: "bad SVCB values", lex: l}
 		}
 		l, _ = c.Next()
 	}
diff --git a/types.go b/types.go
index c9a03dec..8e3129cb 100644
--- a/types.go
+++ b/types.go
@@ -135,8 +135,8 @@ const (
 	RcodeNXRrset        = 8  // NXRRSet   - RR Set that should exist does not [DNS Update]
 	RcodeNotAuth        = 9  // NotAuth   - Server Not Authoritative for zone [DNS Update]
 	RcodeNotZone        = 10 // NotZone   - Name not contained in zone        [DNS Update/TSIG]
-	RcodeBadSig         = 16 // BADSIG    - TSIG Signature Failure            [TSIG]
-	RcodeBadVers        = 16 // BADVERS   - Bad OPT Version                   [EDNS0]
+	RcodeBadSig         = 16 // BADSIG    - TSIG Signature Failure            [TSIG]  https://www.rfc-editor.org/rfc/rfc6895.html#section-2.3
+	RcodeBadVers        = 16 // BADVERS   - Bad OPT Version                   [EDNS0] https://www.rfc-editor.org/rfc/rfc6895.html#section-2.3
 	RcodeBadKey         = 17 // BADKEY    - Key not recognized                [TSIG]
 	RcodeBadTime        = 18 // BADTIME   - Signature out of time window      [TSIG]
 	RcodeBadMode        = 19 // BADMODE   - Bad TKEY Mode                     [TKEY]
@@ -402,6 +402,17 @@ func (rr *X25) String() string {
 	return rr.Hdr.String() + rr.PSDNAddress
 }
 
+// ISDN RR. See RFC 1183, Section 3.2.
+type ISDN struct {
+	Hdr        RR_Header
+	Address    string
+	SubAddress string
+}
+
+func (rr *ISDN) String() string {
+	return rr.Hdr.String() + sprintTxt([]string{rr.Address, rr.SubAddress})
+}
+
 // RT RR. See RFC 1183, Section 3.3.
 type RT struct {
 	Hdr        RR_Header
@@ -786,7 +797,7 @@ func (rr *GPOS) String() string {
 	return rr.Hdr.String() + rr.Longitude + " " + rr.Latitude + " " + rr.Altitude
 }
 
-// LOC RR. See RFC RFC 1876.
+// LOC RR. See RFC 1876.
 type LOC struct {
 	Hdr       RR_Header
 	Version   uint8
@@ -898,6 +909,11 @@ func (rr *RRSIG) String() string {
 	return s
 }
 
+// NXT RR. See RFC 2535.
+type NXT struct {
+	NSEC
+}
+
 // NSEC RR. See RFC 4034 and RFC 3755.
 type NSEC struct {
 	Hdr        RR_Header
@@ -982,7 +998,7 @@ func (rr *TALINK) String() string {
 		sprintName(rr.PreviousName) + " " + sprintName(rr.NextName)
 }
 
-// SSHFP RR. See RFC RFC 4255.
+// SSHFP RR. See RFC 4255.
 type SSHFP struct {
 	Hdr         RR_Header
 	Algorithm   uint8
@@ -996,7 +1012,7 @@ func (rr *SSHFP) String() string {
 		" " + strings.ToUpper(rr.FingerPrint)
 }
 
-// KEY RR. See RFC RFC 2535.
+// KEY RR. See RFC 2535.
 type KEY struct {
 	DNSKEY
 }
@@ -1306,7 +1322,7 @@ type NINFO struct {
 
 func (rr *NINFO) String() string { return rr.Hdr.String() + sprintTxt(rr.ZSData) }
 
-// NID RR. See RFC RFC 6742.
+// NID RR. See RFC 6742.
 type NID struct {
 	Hdr        RR_Header
 	Preference uint16
diff --git a/zduplicate.go b/zduplicate.go
index 450bbbc2..03029fb3 100644
--- a/zduplicate.go
+++ b/zduplicate.go
@@ -481,6 +481,21 @@ func (r1 *IPSECKEY) isDuplicate(_r2 RR) bool {
 	return true
 }
 
+func (r1 *ISDN) isDuplicate(_r2 RR) bool {
+	r2, ok := _r2.(*ISDN)
+	if !ok {
+		return false
+	}
+	_ = r2
+	if r1.Address != r2.Address {
+		return false
+	}
+	if r1.SubAddress != r2.SubAddress {
+		return false
+	}
+	return true
+}
+
 func (r1 *KEY) isDuplicate(_r2 RR) bool {
 	r2, ok := _r2.(*KEY)
 	if !ok {
@@ -871,6 +886,26 @@ func (r1 *NULL) isDuplicate(_r2 RR) bool {
 	return true
 }
 
+func (r1 *NXT) isDuplicate(_r2 RR) bool {
+	r2, ok := _r2.(*NXT)
+	if !ok {
+		return false
+	}
+	_ = r2
+	if !isDuplicateName(r1.NextDomain, r2.NextDomain) {
+		return false
+	}
+	if len(r1.TypeBitMap) != len(r2.TypeBitMap) {
+		return false
+	}
+	for i := 0; i < len(r1.TypeBitMap); i++ {
+		if r1.TypeBitMap[i] != r2.TypeBitMap[i] {
+			return false
+		}
+	}
+	return true
+}
+
 func (r1 *OPENPGPKEY) isDuplicate(_r2 RR) bool {
 	r2, ok := _r2.(*OPENPGPKEY)
 	if !ok {
diff --git a/zmsg.go b/zmsg.go
index 3ea0eb42..39b3bc81 100644
--- a/zmsg.go
+++ b/zmsg.go
@@ -372,6 +372,18 @@ func (rr *IPSECKEY) pack(msg []byte, off int, compression compressionMap, compre
 	return off, nil
 }
 
+func (rr *ISDN) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
+	off, err = packString(rr.Address, msg, off)
+	if err != nil {
+		return off, err
+	}
+	off, err = packString(rr.SubAddress, msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 func (rr *KEY) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
 	off, err = packUint16(rr.Flags, msg, off)
 	if err != nil {
@@ -694,6 +706,18 @@ func (rr *NULL) pack(msg []byte, off int, compression compressionMap, compress b
 	return off, nil
 }
 
+func (rr *NXT) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
+	off, err = packDomainName(rr.NextDomain, msg, off, compression, false)
+	if err != nil {
+		return off, err
+	}
+	off, err = packDataNsec(rr.TypeBitMap, msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 func (rr *OPENPGPKEY) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
 	off, err = packStringBase64(rr.PublicKey, msg, off)
 	if err != nil {
@@ -1746,6 +1770,24 @@ func (rr *IPSECKEY) unpack(msg []byte, off int) (off1 int, err error) {
 	return off, nil
 }
 
+func (rr *ISDN) unpack(msg []byte, off int) (off1 int, err error) {
+	rdStart := off
+	_ = rdStart
+
+	rr.Address, off, err = unpackString(msg, off)
+	if err != nil {
+		return off, err
+	}
+	if off == len(msg) {
+		return off, nil
+	}
+	rr.SubAddress, off, err = unpackString(msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 func (rr *KEY) unpack(msg []byte, off int) (off1 int, err error) {
 	rdStart := off
 	_ = rdStart
@@ -2224,6 +2266,24 @@ func (rr *NULL) unpack(msg []byte, off int) (off1 int, err error) {
 	return off, nil
 }
 
+func (rr *NXT) unpack(msg []byte, off int) (off1 int, err error) {
+	rdStart := off
+	_ = rdStart
+
+	rr.NextDomain, off, err = UnpackDomainName(msg, off)
+	if err != nil {
+		return off, err
+	}
+	if off == len(msg) {
+		return off, nil
+	}
+	rr.TypeBitMap, off, err = unpackDataNsec(msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 func (rr *OPENPGPKEY) unpack(msg []byte, off int) (off1 int, err error) {
 	rdStart := off
 	_ = rdStart
diff --git a/ztypes.go b/ztypes.go
index 1b6f4320..2c70fc44 100644
--- a/ztypes.go
+++ b/ztypes.go
@@ -36,6 +36,7 @@ var TypeToRR = map[uint16]func() RR{
 	TypeHIP:        func() RR { return new(HIP) },
 	TypeHTTPS:      func() RR { return new(HTTPS) },
 	TypeIPSECKEY:   func() RR { return new(IPSECKEY) },
+	TypeISDN:       func() RR { return new(ISDN) },
 	TypeKEY:        func() RR { return new(KEY) },
 	TypeKX:         func() RR { return new(KX) },
 	TypeL32:        func() RR { return new(L32) },
@@ -59,6 +60,7 @@ var TypeToRR = map[uint16]func() RR{
 	TypeNSEC3:      func() RR { return new(NSEC3) },
 	TypeNSEC3PARAM: func() RR { return new(NSEC3PARAM) },
 	TypeNULL:       func() RR { return new(NULL) },
+	TypeNXT:        func() RR { return new(NXT) },
 	TypeOPENPGPKEY: func() RR { return new(OPENPGPKEY) },
 	TypeOPT:        func() RR { return new(OPT) },
 	TypePTR:        func() RR { return new(PTR) },
@@ -204,6 +206,7 @@ func (rr *HINFO) Header() *RR_Header      { return &rr.Hdr }
 func (rr *HIP) Header() *RR_Header        { return &rr.Hdr }
 func (rr *HTTPS) Header() *RR_Header      { return &rr.Hdr }
 func (rr *IPSECKEY) Header() *RR_Header   { return &rr.Hdr }
+func (rr *ISDN) Header() *RR_Header       { return &rr.Hdr }
 func (rr *KEY) Header() *RR_Header        { return &rr.Hdr }
 func (rr *KX) Header() *RR_Header         { return &rr.Hdr }
 func (rr *L32) Header() *RR_Header        { return &rr.Hdr }
@@ -227,6 +230,7 @@ func (rr *NSEC) Header() *RR_Header       { return &rr.Hdr }
 func (rr *NSEC3) Header() *RR_Header      { return &rr.Hdr }
 func (rr *NSEC3PARAM) Header() *RR_Header { return &rr.Hdr }
 func (rr *NULL) Header() *RR_Header       { return &rr.Hdr }
+func (rr *NXT) Header() *RR_Header        { return &rr.Hdr }
 func (rr *OPENPGPKEY) Header() *RR_Header { return &rr.Hdr }
 func (rr *OPT) Header() *RR_Header        { return &rr.Hdr }
 func (rr *PTR) Header() *RR_Header        { return &rr.Hdr }
@@ -437,6 +441,13 @@ func (rr *IPSECKEY) len(off int, compression map[string]struct{}) int {
 	return l
 }
 
+func (rr *ISDN) len(off int, compression map[string]struct{}) int {
+	l := rr.Hdr.len(off, compression)
+	l += len(rr.Address) + 1
+	l += len(rr.SubAddress) + 1
+	return l
+}
+
 func (rr *KX) len(off int, compression map[string]struct{}) int {
 	l := rr.Hdr.len(off, compression)
 	l += 2 // Preference
@@ -966,6 +977,10 @@ func (rr *IPSECKEY) copy() RR {
 	}
 }
 
+func (rr *ISDN) copy() RR {
+	return &ISDN{rr.Hdr, rr.Address, rr.SubAddress}
+}
+
 func (rr *KEY) copy() RR {
 	return &KEY{*rr.DNSKEY.copy().(*DNSKEY)}
 }
@@ -1092,6 +1107,10 @@ func (rr *NULL) copy() RR {
 	return &NULL{rr.Hdr, rr.Data}
 }
 
+func (rr *NXT) copy() RR {
+	return &NXT{*rr.NSEC.copy().(*NSEC)}
+}
+
 func (rr *OPENPGPKEY) copy() RR {
 	return &OPENPGPKEY{rr.Hdr, rr.PublicKey}
 }


Test patch:
diff --git a/parse_test.go b/parse_test.go
index 0096e004..1b8f5db4 100644
--- a/parse_test.go
+++ b/parse_test.go
@@ -1450,6 +1450,23 @@ func TestParseHINFO(t *testing.T) {
 	}
 }
 
+func TestParseISDN(t *testing.T) {
+	dt := map[string]string{
+		"example.net. ISDN A B":         "example.net.	3600	IN	ISDN	\"A\" \"B\"",
+		"example.net. ISDN \"A\" \"B\"": "example.net.	3600	IN	ISDN	\"A\" \"B\"",
+	}
+	for i, o := range dt {
+		rr, err := NewRR(i)
+		if err != nil {
+			t.Error("failed to parse RR: ", err)
+			continue
+		}
+		if rr.String() != o {
+			t.Errorf("`%s' should be equal to\n`%s', but is     `%s'", i, o, rr.String())
+		}
+	}
+}
+
 func TestParseCAA(t *testing.T) {
 	lt := map[string]string{
 		"example.net.	CAA	0 issue \"symantec.com\"":            "example.net.\t3600\tIN\tCAA\t0 issue \"symantec.com\"",
diff --git a/scan_test.go b/scan_test.go
index 218c9750..3332c82d 100644
--- a/scan_test.go
+++ b/scan_test.go
@@ -1,11 +1,14 @@
 package dns
 
 import (
+	"errors"
 	"io"
+	"io/fs"
 	"net"
 	"os"
 	"strings"
 	"testing"
+	"testing/fstest"
 )
 
 func TestZoneParserGenerate(t *testing.T) {
@@ -96,6 +99,78 @@ func TestZoneParserInclude(t *testing.T) {
 	}
 }
 
+func TestZoneParserIncludeFS(t *testing.T) {
+	fsys := fstest.MapFS{
+		"db.foo": &fstest.MapFile{
+			Data: []byte("foo\tIN\tA\t127.0.0.1"),
+		},
+	}
+	zone := "$ORIGIN example.org.\n$INCLUDE db.foo\nbar\tIN\tA\t127.0.0.2"
+
+	var got int
+	z := NewZoneParser(strings.NewReader(zone), "", "")
+	z.SetIncludeAllowed(true)
+	z.SetIncludeFS(fsys)
+	for rr, ok := z.Next(); ok; _, ok = z.Next() {
+		switch rr.Header().Name {
+		case "foo.example.org.", "bar.example.org.":
+		default:
+			t.Fatalf("expected foo.example.org. or bar.example.org., but got %s", rr.Header().Name)
+		}
+		got++
+	}
+	if err := z.Err(); err != nil {
+		t.Fatalf("expected no error, but got %s", err)
+	}
+
+	if expected := 2; got != expected {
+		t.Errorf("failed to parse zone after include, expected %d records, got %d", expected, got)
+	}
+
+	fsys = fstest.MapFS{}
+
+	z = NewZoneParser(strings.NewReader(zone), "", "")
+	z.SetIncludeAllowed(true)
+	z.SetIncludeFS(fsys)
+	z.Next()
+	if err := z.Err(); !errors.Is(err, fs.ErrNotExist) {
+		t.Fatalf(`expected fs.ErrNotExist but got: %T %v`, err, err)
+	}
+}
+
+func TestZoneParserIncludeFSPaths(t *testing.T) {
+	fsys := fstest.MapFS{
+		"baz/bat/db.foo": &fstest.MapFile{
+			Data: []byte("foo\tIN\tA\t127.0.0.1"),
+		},
+	}
+
+	for _, p := range []string{
+		"../bat/db.foo",
+		"/baz/bat/db.foo",
+	} {
+		zone := "$ORIGIN example.org.\n$INCLUDE " + p + "\nbar\tIN\tA\t127.0.0.2"
+		var got int
+		z := NewZoneParser(strings.NewReader(zone), "", "baz/quux/db.bar")
+		z.SetIncludeAllowed(true)
+		z.SetIncludeFS(fsys)
+		for rr, ok := z.Next(); ok; _, ok = z.Next() {
+			switch rr.Header().Name {
+			case "foo.example.org.", "bar.example.org.":
+			default:
+				t.Fatalf("$INCLUDE %q: expected foo.example.org. or bar.example.org., but got %s", p, rr.Header().Name)
+			}
+			got++
+		}
+		if err := z.Err(); err != nil {
+			t.Fatalf("$INCLUDE %q: expected no error, but got %s", p, err)
+		}
+		if expected := 2; got != expected {
+			t.Errorf("$INCLUDE %q: failed to parse zone after include, expected %d records, got %d", p, expected, got)
+		}
+	}
+}
+
 func TestZoneParserIncludeDisallowed(t *testing.T) {
 	tmpfile, err := os.CreateTemp("", "dns")
 	if err != nil {