XML validation
Given an XML document and an XSD schema definition validate that the document follows the schema described.
Sample XML and XSD for tests can be found on this W3 Schools page.
C
At the time of writing, the XML and XSD files at the URLs used in the other examples were inaccessible. The files from the W3 Schools page were used for tests. <lang C>
- include <libxml/xmlschemastypes.h>
int main(int argC, char** argV) { if (argC <= 2) { printf("Usage: %s <XML Document Name> <XSD Document Name>\n", argV[0]); return 0; }
xmlDocPtr doc; xmlSchemaPtr schema = NULL; xmlSchemaParserCtxtPtr ctxt; char *XMLFileName = argV[1]; char *XSDFileName = argV[2]; int ret;
xmlLineNumbersDefault(1);
ctxt = xmlSchemaNewParserCtxt(XSDFileName);
xmlSchemaSetParserErrors(ctxt, (xmlSchemaValidityErrorFunc) fprintf, (xmlSchemaValidityWarningFunc) fprintf, stderr); schema = xmlSchemaParse(ctxt); xmlSchemaFreeParserCtxt(ctxt);
doc = xmlReadFile(XMLFileName, NULL, 0);
if (doc == NULL){ fprintf(stderr, "Could not parse %s\n", XMLFileName); } else{ xmlSchemaValidCtxtPtr ctxt;
ctxt = xmlSchemaNewValidCtxt(schema); xmlSchemaSetValidErrors(ctxt, (xmlSchemaValidityErrorFunc) fprintf, (xmlSchemaValidityWarningFunc) fprintf, stderr); ret = xmlSchemaValidateDoc(ctxt, doc);
if (ret == 0){ printf("%s validates\n", XMLFileName); } else if (ret > 0){ printf("%s fails to validate\n", XMLFileName); } else{ printf("%s validation generated an internal error\n", XMLFileName); } xmlSchemaFreeValidCtxt(ctxt); xmlFreeDoc(doc); }
if(schema != NULL)
xmlSchemaFree(schema);
xmlSchemaCleanupTypes(); xmlCleanupParser(); xmlMemoryDump();
return 0; } </lang> Output, files used from the W3 Schools page :
C:\rosettaCode>xmlValidator.exe shiporder.xml shiporder.xsd shiporder.xml validates
C#
<lang csharp> using System; using System.Xml; using System.Xml.Schema; using System.IO;
public class Test { public static void Main() { // your code goes here XmlSchemaSet sc = new XmlSchemaSet(); sc.Add(null, "http://venus.eas.asu.edu/WSRepository/xml/Courses.xsd"); XmlReaderSettings settings = new XmlReaderSettings(); settings.ValidationType = ValidationType.Schema; settings.Schemas = sc; settings.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack); // Create the XmlReader object. XmlReader reader = XmlReader.Create("http://venus.eas.asu.edu/WSRepository/xml/Courses.xml", settings); // Parse the file. while (reader.Read()); // will call event handler if invalid Console.WriteLine("The XML file is valid for the given xsd file"); }
// Display any validation errors. private static void ValidationCallBack(object sender, ValidationEventArgs e) { Console.WriteLine("Validation Error: {0}", e.Message); } } </lang>
F#
Using an inline stylesheet:
<lang fsharp>open System.Xml open System.Xml.Schema open System.IO
let xml = @"<root> <xs:schema id='an-element' targetNamespace='example' xmlns:mstns='example' xmlns='example' xmlns:xs='http://www.w3.org/2001/XMLSchema' attributeFormDefault='unqualified' elementFormDefault='qualified'>
<xs:element name='an-element'> <xs:complexType> <xs:sequence minOccurs='0' maxOccurs='unbounded'> <xs:element name='another-element' nillable='true'> <xs:complexType> <xs:simpleContent> <xs:extension base='xs:string'> <xs:attribute name='an-attribute' form='unqualified' type='xs:boolean' /> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element>
</xs:schema> <an-element xmlns='example'>
<another-element an-attribute='false'>...</another-element> <another-element an-attribute='wrong'>123</another-element>
</an-element> </root>"
let validationData withWarnings =
let errors = ref 0 let warnings = ref 0 fun input -> match input with | Some(msg, severity) -> if severity = XmlSeverityType.Error then errors := !errors + 1 printfn "Validation error: %s" msg elif withWarnings then warnings := !warnings + 1 printfn "Validation warning: %s" msg None | None -> if withWarnings then Some(dict[XmlSeverityType.Error, !errors; XmlSeverityType.Warning, !warnings]) else Some(dict[XmlSeverityType.Error, !errors])
[<EntryPoint>] let main argv =
let withWarnings = argv.Length > 0 && argv.[0] = "-w" let vData = validationData withWarnings let validationEvent = new ValidationEventHandler(fun _ e -> vData (Some(e.Message, e.Severity)) |> ignore) let settings = new XmlReaderSettings() settings.ValidationType <- ValidationType.Schema settings.ValidationEventHandler.AddHandler(validationEvent) settings.ValidationFlags <- settings.ValidationFlags ||| XmlSchemaValidationFlags.ProcessInlineSchema ||| XmlSchemaValidationFlags.ReportValidationWarnings let reader = XmlReader.Create(new StringReader(xml), settings); while reader.Read() do () printfn "%A" (Seq.toList (vData None).Value) 0
</lang>
- Output:
>RosettaCode Validation error: The 'an-attribute' element is invalid - The value 'wrong' is invalid according to its datatype 'http://www.w3.org/2001/XMLSchema:boolean' - The string 'wrong' is not a valid boolean value. [[Error, 1]] >RosettaCode -w Validation warning: Could not find schema information for the element 'root'. Validation error: The 'an-attribute' element is invalid - The value 'wrong' is invalid according to its datatype 'http://www.w3.org/2001/XMLSchema:boolean' - The string 'wrong' is not a valid boolean value. [[Error, 1]; [Warning, 1]]
Changing wrong
to a boolean, e. g. true
, The result (without -w) is
[[Error, 0]]
Go
This uses the w3schools test data linked to above.
<lang go>package main
import (
"fmt" "github.com/lestrrat-go/libxml2" "github.com/lestrrat-go/libxml2/xsd" "io/ioutil" "log" "os"
)
func check(err error) {
if err != nil { log.Fatal(err) }
}
func main() {
xsdfile := "shiporder.xsd" f, err := os.Open(xsdfile) check(err) defer f.Close()
buf, err := ioutil.ReadAll(f) check(err)
s, err := xsd.Parse(buf) check(err) defer s.Free()
xmlfile := "shiporder.xml" f2, err := os.Open(xmlfile) check(err) defer f2.Close()
buf2, err := ioutil.ReadAll(f2) check(err)
d, err := libxml2.Parse(buf2) check(err)
if err := s.Validate(d); err != nil { for _, e := range err.(xsd.SchemaValidationError).Errors() { log.Printf("error: %s", e.Error()) } return }
fmt.Println("Validation of", xmlfile, "against", xsdfile, "successful!")
}</lang>
- Output:
Validation of shiporder.xml against shiporder.xsd successful!
Groovy
Solution: <lang groovy>import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI import javax.xml.transform.stream.StreamSource import javax.xml.validation.SchemaFactory import org.xml.sax.SAXParseException
def factory = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI) def validate = { schemaURL, docURL ->
try { factory.newSchema(schemaURL.toURL()).newValidator().validate(new StreamSource(docURL)) true } catch (SAXParseException e) { false }
}</lang>
Test: <lang groovy>def schemaLoc = "http://venus.eas.asu.edu/WSRepository/xml/Courses.xsd" def docLoc = "http://venus.eas.asu.edu/WSRepository/xml/Courses.xml" println "Document is ${validate(schemaLoc, docLoc)? 'valid' : 'invalid'}"</lang>
Java
<lang java>import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI;
import java.net.MalformedURLException; import java.net.URL;
import javax.xml.transform.stream.StreamSource; import javax.xml.validation.SchemaFactory; import javax.xml.validation.Validator; import javax.xml.ws.Holder;
import org.xml.sax.ErrorHandler; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException;
public class XmlValidation { public static void main(String... args) throws MalformedURLException { URL schemaLocation = new URL("http://venus.eas.asu.edu/WSRepository/xml/Courses.xsd"); URL documentLocation = new URL("http://venus.eas.asu.edu/WSRepository/xml/Courses.xml"); if (validate(schemaLocation, documentLocation)) { System.out.println("document is valid"); } else { System.out.println("document is invalid"); } }
// The least code you need for validation public static boolean minimalValidate(URL schemaLocation, URL documentLocation) { SchemaFactory factory = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI); try { Validator validator = factory.newSchema(schemaLocation).newValidator(); validator.validate(new StreamSource(documentLocation.toString())); return true; } catch (Exception e) { return false; } }
// A more complete validator public static boolean validate(URL schemaLocation, URL documentLocation) { SchemaFactory factory = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI); final Holder<Boolean> valid = new Holder<>(true); try { Validator validator = factory.newSchema(schemaLocation).newValidator(); // Get some better diagnostics out validator.setErrorHandler(new ErrorHandler(){ @Override public void warning(SAXParseException exception) { System.out.println("warning: " + exception.getMessage()); }
@Override public void error(SAXParseException exception) { System.out.println("error: " + exception.getMessage()); valid.value = false; }
@Override public void fatalError(SAXParseException exception) throws SAXException { System.out.println("fatal error: " + exception.getMessage()); throw exception; }}); validator.validate(new StreamSource(documentLocation.toString())); return valid.value; } catch (SAXException e) { // Already reported above return false; } catch (Exception e) { // If this is the only thing that throws, it's a gross error System.err.println(e); return false; } } }</lang>
Julia
<lang julia>using LightXML
const Xptr = LightXML.Xptr
function validate(url::String, schemafile::String)
ctxt = ccall((:xmlSchemaNewParserCtxt, LightXML.libxml2), Xptr, (Cstring,), schemafile) ctxt != C_NULL || throw(LightXML.XMLNoRootError()) schema = ccall((:xmlSchemaParse, LightXML.libxml2), Xptr, (Xptr,), ctxt) schema != C_NULL || throw(LightXML.XMLNoRootError()) ccall((:xmlSchemaFreeParserCtxt, LightXML.libxml2), Cvoid, (Xptr,), ctxt) ctxt = ccall((:xmlSchemaNewValidCtxt, LightXML.libxml2), Xptr, (Xptr,), schema) err = ccall((:xmlSchemaValidateFile, LightXML.libxml2), Cint, (Ptr{LightXML.xmlBuffer}, Cstring), ctxt, url) return err == 0 ? true : false
end
function xsdvalidatexml()
if length(ARGS) != 2 println(" Usage: julia ", PROGRAM_FILE, ", xmlfilename xsdfilename") elseif validate(ARGS[1], ARGS[2]) println("File ", ARGS[1], " validates as correct XML using the XSD file ", ARGS[2], ".") else println("File ", ARGS[1]. "does not validate.") end
end
xsdvalidatexml() </lang>
Kotlin
Assuming that libxml2 is already installed on your system in the default location(s), you first need to build libxml_schemas.klib using the following .def file and the cinterop tool:
// libxml_schemas.def headers = /usr/include/libxml2/libxml/xmlschemastypes.h compilerOpts = -I/usr/include/libxml2 linkerOpts = -L/usr/lib/x86_64-linux-gnu -lxml2
Next, you need to compile the following Kotlin program, linking against libxml_schemas.klib. <lang scala>// Kotlin Native v0.6
import kotlinx.cinterop.* import platform.posix.* import libxml_schemas.*
fun err(ctx: COpaquePointer?, msg: CPointer<ByteVar>?, extra: CPointer<ByteVar>?) {
val fp = ctx?.reinterpret<FILE>() fprintf(fp, msg?.toKString(), extra?.toKString())
}
fun warn(ctx: COpaquePointer?, msg: CPointer<ByteVar>?, extra: CPointer<ByteVar>?) {
err(ctx, msg, extra)
}
fun main(args: Array<String>) {
if (args.size != 2) { println("You need to pass exactly 2 command line arguments, namely:") println(" <XML Document Name> <XSD Document Name>") return }
val xmlFileName = args[0] val xsdFileName = args[1] xmlLineNumbersDefault(1) val ctxt = xmlSchemaNewParserCtxt(xsdFileName)
xmlSchemaSetParserErrors( ctxt, staticCFunction(::err) as xmlSchemaValidityErrorFunc?, staticCFunction(::warn) as xmlSchemaValidityWarningFunc?, stderr )
val schema = xmlSchemaParse(ctxt) xmlSchemaFreeParserCtxt(ctxt)
val doc = xmlReadFile(xmlFileName, null, 0) if (doc == null) { println("Could not parse $xmlFileName") } else { val ctxt2 = xmlSchemaNewValidCtxt(schema)
xmlSchemaSetValidErrors( ctxt2, staticCFunction(::err) as xmlSchemaValidityErrorFunc?, staticCFunction(::warn) as xmlSchemaValidityWarningFunc?, stderr )
val ret = xmlSchemaValidateDoc(ctxt2, doc) if (ret == 0) println("$xmlFileName validates") else if (ret > 0) println("$xmlFileName fails to validate") else println("$xmlFileName generated an internal error") xmlSchemaFreeValidCtxt(ctxt2) xmlFreeDoc(doc) }
if (schema != null) xmlSchemaFree(schema) xmlSchemaCleanupTypes() xmlCleanupParser() xmlMemoryDump()
}</lang> Finally, the resulting .kexe file should be executed passing it similar command line arguments to the C entry to produce the following output.
$ ./xmlval.kexe shiporder.xml shiporder.xsd shiporder.xml validates
Nim
As in the C version, we use “libxml2” for the validation. As there is no Nim binding for this library, we provide the necessary definitions in our program (three types and six procedures). There is nothing more to do. In Nim, interfacing with C is often very easy.
Our program is based on the C version with many differences. In particular, we use the function “xmlSchemaValidateFile” rather than the function “xmlSchemaValidateDoc”.
<lang Nim>import os, strformat
const LibXml = "libxml2.so"
type
XmlSchemaParserCtxtPtr = pointer XmlSchemaPtr = pointer XmlSchemaValidCtxtPtr = pointer
- Declaration of needed "libxml2" procedures.
proc xmlSchemaNewParserCtxt(url: cstring): XmlSchemaParserCtxtPtr
{.cdecl, dynlib: LibXml, importc: "xmlSchemaNewParserCtxt".}
proc xmlSchemaParse(ctxt: XmlSchemaParserCtxtPtr): XmlSchemaPtr
{.cdecl, dynlib: LibXml, importc: "xmlSchemaParse".}
proc xmlSchemaFreeParserCtxt(ctxt: XmlSchemaParserCtxtPtr)
{.cdecl, dynlib: LibXml, importc: "xmlSchemaFreeParserCtxt".}
proc xmlSchemaNewValidCtxt(schema: XmlSchemaPtr): XmlSchemaValidCtxtPtr
{.cdecl, dynlib: LibXml, importc: "xmlSchemaNewValidCtxt".}
proc xmlSchemaValidateFile(ctxt: XmlSchemaValidCtxtPtr; filename: cstring; options: cint): cint
{.cdecl, dynlib: LibXml, importc: "xmlSchemaValidateFile".}
proc xmlSchemaFreeValidCtxt(ctxt: XmlSchemaValidCtxtPtr)
{.cdecl, dynlib: LibXml, importc: "xmlSchemaFreeValidCtxt".}
if paramCount() != 2:
quit &"Usage: {getAppFilename().lastPathPart} <XML Document Name> <XSD Document Name", QuitFailure
let xmlFilename = paramStr(1) let xsdFilename = paramStr(2)
- Parse XML schema file.
let parserCtxt = xmlSchemaNewParserCtxt(xsdFilename) let schema = parserCtxt.xmlSchemaParse() parserCtxt.xmlSchemaFreeParserCtxt()
- Validate XML file using XML schema.
let validCtxt = schema.xmlSchemaNewValidCtxt() case validCtxt.xmlSchemaValidateFile(xmlFilename, 0) of 0:
echo &"“{xmlFilename}” validates."
of -1:
echo &"“{xmlFilename}” validation generated an internal error."
else:
echo &"“{xmlFilename}” fails to validate."
validCtxt.xmlSchemaFreeValidCtxt()</lang>
- Output:
Using command ./xml_validate shiporder.xml shiporder.xsd
:
“shiporder.xml” validates.
Using a modified file “shiporder1.xml” where tag “orderperson” has been replaced by “orderperson1”:
Entity: line 6: Schemas validity error : Element 'orderperson1': This element is not expected. Expected is ( orderperson ). “shiporder1.xml” fails to validate.
Perl
<lang perl>#!/usr/bin/env perl -T use 5.018_002; use warnings; use Try::Tiny; use XML::LibXML;
our $VERSION = 1.000_000;
my $parser = XML::LibXML->new();
my $good_xml = '<a>5</a>'; my $bad_xml = '<a>5foobar</a>'; my $xmlschema_markup = <<'END'; <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="a" type="xsd:integer"/>
</xsd:schema> END
my $xmlschema = XML::LibXML::Schema->new( string => $xmlschema_markup );
for ( $good_xml, $bad_xml ) {
my $doc = $parser->parse_string($_); try { $xmlschema->validate($doc); } finally { if (@_) { say "Not valid: @_"; } else { say 'Valid'; } };
}</lang>
- Output:
Valid Not valid: unknown-7fe99976a9a0:0: Schemas validity error : Element 'a': Element content is not allowed, because the type definition is simple.
Python
<lang python>#!/bin/python from __future__ import print_function import lxml from lxml import etree
if __name__=="__main__":
parser = etree.XMLParser(dtd_validation=True) schema_root = etree.XML(\ <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="a" type="xsd:integer"/> </xsd:schema> ) schema = etree.XMLSchema(schema_root)
#Good xml parser = etree.XMLParser(schema = schema) try: root = etree.fromstring("<a>5</a>", parser) print ("Finished validating good xml") except lxml.etree.XMLSyntaxError as err: print (err)
#Bad xml parser = etree.XMLParser(schema = schema) try: root = etree.fromstring("<a>5foobar</a>", parser) except lxml.etree.XMLSyntaxError as err: print (err)</lang>
- Output:
Finished validating good xml Element 'a': Element content is not allowed, because the type definition is simple.
Raku
(formerly Perl 6)
<lang perl6>
- Reference: https://github.com/libxml-raku/LibXML-raku
use v6.d; use LibXML; use LibXML::Schema;
my $good_xml = '<a>5</a>'; my $bad_xml = '<a>5foobar</a>';
my $xsdschema = q:to<EOF>;
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="a" type="xsd:integer"/> </xsd:schema>
EOF
my LibXML $p .= new();
for ( $good_xml, $bad_xml ) {
my $x = $p.parse: :string($_); try { LibXML::Schema.new( string => $xsdschema ).validate( $x ) } !$! ?? say "Valid." !! say $!.message() ;
}</lang>
- Output:
Valid. Schemas validity error : Element 'a': Element content is not allowed, because the type definition is simple.
Scala
<lang Scala>import java.net.URL
import javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI import javax.xml.transform.stream.StreamSource import javax.xml.validation.SchemaFactory import javax.xml.ws.Holder import org.xml.sax.{ErrorHandler, SAXException, SAXParseException}
object XmlValidation extends App {
val (schemaLocation, documentLocation) = (new URL("http://venus.eas.asu.edu/WSRepository/xml/Courses.xsd") , new URL("http://venus.eas.asu.edu/WSRepository/xml/Courses.xml"))
println(s"Document is ${if (validate(schemaLocation, documentLocation)) "valid" else "invalid"}.")
// A more complete validator def validate(schemaLocation: URL, documentLocation: URL): Boolean = { val factory = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI) val valid = new Holder[Boolean](true) try { val validator = factory.newSchema(schemaLocation).newValidator // Get some better diagnostics out validator.setErrorHandler(new ErrorHandler() { override def warning(exception: SAXParseException) = println("warning: " + exception.getMessage)
override def error(exception: SAXParseException) = { println("error: " + exception.getMessage) valid.value = false }
override def fatalError(exception: SAXParseException) = { println("fatal error: " + exception.getMessage) throw exception } }) validator.validate(new StreamSource(documentLocation.toString)) valid.value } catch { case _: SAXException => // Already reported above false case e: Exception => // If this is the only thing that throws, it's a gross error println(e) false } }
}</lang>
Sidef
<lang ruby>require('XML::LibXML')
func is_valid_xml(str, schema) {
var parser = %O<XML::LibXML>.new var xmlschema = %O<XML::LibXML::Schema>.new(string => schema)
try { xmlschema.validate(parser.parse_string(str)) true } catch { false }
}
var good_xml = '<a>5</a>' var bad_xml = '<a>5foobar</a>'
var xmlschema_markup = <<'END' <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="a" type="xsd:integer"/>
</xsd:schema> END
[good_xml, bad_xml].each { |xml|
say "is_valid_xml(#{xml.dump}) : #{is_valid_xml(xml, xmlschema_markup)}"
}</lang>
- Output:
is_valid_xml("<a>5</a>") : true is_valid_xml("<a>5<b>foobar</b></a>") : false
Visual Basic .NET
Compiler: Roslyn Visual Basic (language version >= 14, e.g. with Visual Studio 2015)
<lang vbnet>Option Compare Binary Option Explicit On Option Infer On Option Strict On
Imports System.Xml Imports System.Xml.Schema
Module Program
Function GetValidationErrors(doc As XDocument, schemaSet As XmlSchemaSet) As IList(Of ValidationEventArgs) GetValidationErrors = New List(Of ValidationEventArgs) doc.Validate(schemaSet, Sub(sender, e) GetValidationErrors.Add(e)) End Function
Sub Main() ' These functions are declared in another module found below. Dim schema = GetSchema() Dim document = GetDocument()
Dim schemaSet As New XmlSchemaSet() schemaSet.Add(XmlSchema.Read(schema.CreateReader(), Nothing))
Dim errors = GetValidationErrors(document, schemaSet) For Each e In errors Console.WriteLine($"Validation {e.Severity}:{vbCrLf}{e.Message}") Next
If errors.Count = 0 Then Console.WriteLine("The document is valid.") End Sub
End Module</lang>
- Output:
Validation Error: The 'an-attribute' attribute is invalid - The value 'wrong' is invalid according to its datatype 'http://www.w3.org/2001/XMLSchema:boolean' - The string 'wrong' is not a valid Boolean value.
An alternative is to use XmlReader (like the C# and F# examples [as of 2019-08-06]).
<lang vbnet> Function GetValidationErrorsXmlReader(doc As XDocument, schemaSet As XmlSchemaSet, warnings As Boolean) As IList(Of ValidationEventArgs)
GetValidationErrorsReader = New List(Of ValidationEventArgs)
Dim settings As New XmlReaderSettings() With settings .ValidationType = ValidationType.Schema .Schemas = schemaSet If warnings Then .ValidationFlags = .ValidationFlags Or XmlSchemaValidationFlags.ReportValidationWarnings End With
AddHandler settings.ValidationEventHandler, Sub(sender, e) GetValidationErrorsReader.Add(e)
Using reader = XmlReader.Create(doc.CreateReader(), settings) Do While reader.Read() : Loop End Using End Function</lang>
Creating the documents (same as F#) from strings (does not handle syntax errors):
<lang vbnet>Module Constants
Const SCHEMA As String =
"<?xml version='1.0'?> <xs:schema id='an-element' targetNamespace='example' xmlns:mstns='example' xmlns='example' xmlns:xs='http://www.w3.org/2001/XMLSchema' attributeFormDefault='unqualified' elementFormDefault='qualified'>
<xs:element name='an-element'> <xs:complexType> <xs:sequence minOccurs='0' maxOccurs='unbounded'> <xs:element name='another-element' nillable='true'> <xs:complexType> <xs:simpleContent> <xs:extension base='xs:string'> <xs:attribute name='an-attribute' form='unqualified' type='xs:boolean'/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element>
</xs:schema>"
Const DOCUMENT As String =
"<?xml version='1.0'?> <an-element xmlns='example'>
<another-element an-attribute='false'>...</another-element> <another-element an-attribute='wrong'>123</another-element>
</an-element>"
Function GetSchema() As XDocument Return XDocument.Parse(SCHEMA) End Function
Function GetDocument() As XDocument Return XDocument.Parse(DOCUMENT) End Function
End Module</lang>
Alternatively, we can be cheeky and use VB's XML literals...
<lang vbnet>Module Constants
Function GetDocument() As XDocument Return _ <?xml version="1.0"?> <an-element xmlns="example"> <another-element an-attribute="false">...</another-element> <another-element an-attribute="wrong"> 123</another-element> </an-element> End Function
Function GetSchema() As XDocument Return _ <?xml version="1.0"?> <xs:schema id="an-element" targetNamespace="example" xmlns:mstns="example" xmlns="example" xmlns:xs="http://www.w3.org/2001/XMLSchema" attributeFormDefault="unqualified" elementFormDefault="qualified"> <xs:element name="an-element"> <xs:complexType> <xs:sequence minOccurs="0" maxOccurs="unbounded"> <xs:element name="another-element" nillable="true"> <xs:complexType> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="an-attribute" form="unqualified" type="xs:boolean"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> End Function
End Module</lang>