XmlSchemaKeyref Class
This class represents the keyref element from XMLSchema as specified by the World Wide Web Consortium (W3C).
Assembly: System.Xml (in System.Xml.dll)
The following example creates a key element.
Imports System Imports System.Collections Imports System.IO Imports System.Xml Imports System.Xml.Xsl Imports System.Xml.Schema Public Class XmlSchemaObjectGenerator Private Shared Sub ValidationCallback(sender As Object, args As ValidationEventArgs) If args.Severity = XmlSeverityType.Warning Then Console.Write("WARNING: ") Else If args.Severity = XmlSeverityType.Error Then Console.Write("ERROR: ") End If End If Console.WriteLine(args.Message) End Sub 'ValidationCallback Public Shared Sub Main() Dim tr As New XmlTextReader("empty.xsd") Dim schema As XmlSchema = XmlSchema.Read(tr, New ValidationEventHandler(AddressOf ValidationCallback)) schema.ElementFormDefault = XmlSchemaForm.Qualified schema.TargetNamespace = "http://www.example.com/Report" If (True) Then Dim element As New XmlSchemaElement() element.Name = "purchaseReport" Dim element_complexType As New XmlSchemaComplexType() Dim element_complexType_sequence As New XmlSchemaSequence() If (True) Then Dim element_complexType_sequence_element As New XmlSchemaElement() element_complexType_sequence_element.Name = "region" element_complexType_sequence_element.SchemaTypeName = New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema") If (True) Then Dim element_complexType_sequence_element_keyref As New XmlSchemaKeyref() element_complexType_sequence_element_keyref.Name = "dummy2" element_complexType_sequence_element_keyref.Selector = New XmlSchemaXPath() element_complexType_sequence_element_keyref.Selector.XPath = "r:zip/r:part" If (True) Then Dim field As New XmlSchemaXPath() field.XPath = "@number" element_complexType_sequence_element_keyref.Fields.Add(field) End If element_complexType_sequence_element_keyref.Refer = New XmlQualifiedName("pNumKey", "http://www.example.com/Report") element_complexType_sequence_element.Constraints.Add(element_complexType_sequence_element_keyref) End If element_complexType_sequence.Items.Add(element_complexType_sequence_element) End If element_complexType.Particle = element_complexType_sequence If (True) Then Dim element_complexType_attribute As New XmlSchemaAttribute() element_complexType_attribute.Name = "periodEnding" element_complexType_attribute.SchemaTypeName = New XmlQualifiedName("date", "http://www.w3.org/2001/XMLSchema") element_complexType.Attributes.Add(element_complexType_attribute) End If element.SchemaType = element_complexType If (True) Then Dim element_key As New XmlSchemaKey() element_key.Name = "pNumKey" element_key.Selector = New XmlSchemaXPath() element_key.Selector.XPath = "r:parts/r:part" If (True) Then Dim field As New XmlSchemaXPath() field.XPath = "@number" element_key.Fields.Add(field) End If element.Constraints.Add(element_key) End If schema.Items.Add(element) End If schema.Write(Console.Out) End Sub 'Main End Class 'XmlSchemaObjectGenerator ' Main() 'XmlSchemaObjectGenerator
#using <mscorlib.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::Collections;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Xsl;
using namespace System::Xml::Schema;
__gc public class XmlSchemaObjectGenerator
{
public:
static void ValidationCallback(Object* /*sender*/, ValidationEventArgs * args)
{
if (args -> Severity == XmlSeverityType::Warning)
Console::Write(S"WARNING: ");
else if (args -> Severity == XmlSeverityType::Error)
Console::Write(S"ERROR: ");
Console::WriteLine(args -> Message);
}
}; // XmlSchemaObjectGenerator
int main()
{
XmlTextReader* tr = new XmlTextReader(S"empty.xsd");
XmlSchema * schema = XmlSchema::Read(tr, new ValidationEventHandler(schema, XmlSchemaObjectGenerator::ValidationCallback));
schema -> ElementFormDefault = XmlSchemaForm::Qualified;
schema -> TargetNamespace = S"http://www.example.com/Report";
{
XmlSchemaElement* element = new XmlSchemaElement();
element -> Name = S"purchaseReport";
XmlSchemaComplexType* element_complexType = new XmlSchemaComplexType();
XmlSchemaSequence* element_complexType_sequence = new XmlSchemaSequence();
{
XmlSchemaElement* element_complexType_sequence_element = new XmlSchemaElement();
element_complexType_sequence_element -> Name = S"region";
element_complexType_sequence_element -> SchemaTypeName = new XmlQualifiedName(S"String*", S"http://www.w3.org/2001/XMLSchema");
{
XmlSchemaKeyref* element_complexType_sequence_element_keyref = new XmlSchemaKeyref();
element_complexType_sequence_element_keyref -> Name = S"dummy2";
element_complexType_sequence_element_keyref -> Selector = new XmlSchemaXPath();
element_complexType_sequence_element_keyref -> Selector -> XPath = S"r:zip/r:part";
{
XmlSchemaXPath* field = new XmlSchemaXPath();
field -> XPath = S"@number";
element_complexType_sequence_element_keyref -> Fields->Add(field);
}
element_complexType_sequence_element_keyref -> Refer = new XmlQualifiedName(S"pNumKey", S"http://www.example.com/Report");
element_complexType_sequence_element -> Constraints->Add(element_complexType_sequence_element_keyref);
}
element_complexType_sequence -> Items->Add(element_complexType_sequence_element);
}
element_complexType -> Particle = element_complexType_sequence;
{
XmlSchemaAttribute* element_complexType_attribute = new XmlSchemaAttribute();
element_complexType_attribute -> Name = S"periodEnding";
element_complexType_attribute -> SchemaTypeName = new XmlQualifiedName(S"date", S"http://www.w3.org/2001/XMLSchema");
element_complexType -> Attributes->Add(element_complexType_attribute);
}
element -> SchemaType = element_complexType;
{
XmlSchemaKey* element_key = new XmlSchemaKey();
element_key -> Name = S"pNumKey";
element_key -> Selector = new XmlSchemaXPath();
element_key -> Selector -> XPath = S"r:parts/r:part";
{
XmlSchemaXPath* field = new XmlSchemaXPath();
field -> XPath = S"@number";
element_key -> Fields->Add(field);
}
element -> Constraints->Add(element_key);
}
schema -> Items->Add(element);
}
schema -> Write(Console::Out);
} // main
The following XML file is generated for the preceding code example.
<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:r="http://www.example.com/Report" elementFormDefault="qualified" targetNamespace="http://www.example.com/Report" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="purchaseReport">
<xs:complexType>
<xs:sequence>
<xs:element name="region" type="xs:string">
<xs:keyref name="dummy2" refer="r:pNumKey">
<xs:selector xpath="r:zip/r:part" />
<xs:field xpath="@number" />
</xs:keyref>
</xs:element>
</xs:sequence>
<xs:attribute name="periodEnding" type="xs:date" />
</xs:complexType>
<xs:key name="pNumKey">
<xs:selector xpath="r:parts/r:part" />
<xs:field xpath="@number" />
</xs:key>
</xs:element>
</xs:schema>
System.Xml.Schema.XmlSchemaObject
System.Xml.Schema.XmlSchemaAnnotated
System.Xml.Schema.XmlSchemaIdentityConstraint
System.Xml.Schema.XmlSchemaKeyref
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.