XmlSchemaSimpleTypeUnion Class
Represents the union element for simple types from XML Schema as specified by the World Wide Web Consortium (W3C). A union datatype can be used to specify the content of a simpleType. The value of the simpleType element must be any one of a set of alternative datatypes specified in the union. Union types are always derived types and must comprise at least two alternative datatypes.
Assembly: System.Xml (in System.Xml.dll)
The following example shows the use of XmlSchemaSimpleTypeUnion class.
Imports System Imports System.Xml Imports System.Xml.Schema Class XMLSchemaExamples Public Shared Sub Main() Dim schema As New XmlSchema() ' <xs:simpleType name="StringOrIntType"> Dim StringOrIntType As New XmlSchemaSimpleType() StringOrIntType.Name = "StringOrIntType" schema.Items.Add(StringOrIntType) ' <xs:union> Dim union As New XmlSchemaSimpleTypeUnion StringOrIntType.Content = union ' <xs:simpleType> Dim simpleType1 As New XmlSchemaSimpleType union.BaseTypes.Add(simpleType1) ' <xs:restriction base="xs:string"/> Dim restriction1 As New XmlSchemaSimpleTypeRestriction() restriction1.BaseTypeName = New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema") simpleType1.Content = restriction1 ' <xs:simpleType> Dim simpleType2 As New XmlSchemaSimpleType() union.BaseTypes.Add(simpleType2) ' <xs:restriction base="xs:int"/> Dim restriction2 As New XmlSchemaSimpleTypeRestriction() restriction2.BaseTypeName = New XmlQualifiedName("int", "http://www.w3.org/2001/XMLSchema") simpleType2.Content = restriction2 ' <xs:element name="size" type="StringOrIntType"/> Dim elementSize As New XmlSchemaElement() elementSize.Name = "size" elementSize.SchemaTypeName = New XmlQualifiedName("StringOrIntType") schema.Items.Add(elementSize) Dim schemaSet As New XmlSchemaSet() AddHandler schemaSet.ValidationEventHandler, AddressOf ValidationCallbackOne schemaSet.Add(schema) schemaSet.Compile() Dim compiledSchema As XmlSchema = Nothing For Each schema1 As XmlSchema In schemaSet.Schemas() compiledSchema = schema1 Next Dim nsmgr As New XmlNamespaceManager(New NameTable()) nsmgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema") compiledSchema.Write(Console.Out, nsmgr) End Sub Public Shared Sub ValidationCallbackOne(ByVal sender As Object, ByVal args As ValidationEventArgs) Console.WriteLine(args.Message) End Sub End Class
The following XML file is generated for this code example.
<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="StringOrIntType">
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:string"/>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:int"/>
</xs:simpleType>
</xs:union>
</xs:simpleType>
<xs:element name="size" type="StringOrIntType"/>
</xs:schema>
System.Xml.Schema.XmlSchemaObject
System.Xml.Schema.XmlSchemaAnnotated
System.Xml.Schema.XmlSchemaSimpleTypeContent
System.Xml.Schema.XmlSchemaSimpleTypeUnion
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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.