XmlSchemaKeyref Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
This class represents the keyref element from XMLSchema as specified by the World Wide Web Consortium (W3C).
public ref class XmlSchemaKeyref : System::Xml::Schema::XmlSchemaIdentityConstraintpublic class XmlSchemaKeyref : System.Xml.Schema.XmlSchemaIdentityConstrainttype XmlSchemaKeyref = class
inherit XmlSchemaIdentityConstraintPublic Class XmlSchemaKeyref
Inherits XmlSchemaIdentityConstraint- Inheritance
Examples
The following example creates a key element.
#using <System.Xml.dll>
#using <System.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;
public ref class XmlSchemaObjectGenerator
{
private:
static void ValidationCallback( Object^ /*sender*/, ValidationEventArgs^ args )
{
if ( args->Severity == XmlSeverityType::Warning )
Console::Write( "WARNING: " );
else
if ( args->Severity == XmlSeverityType::Error )
Console::Write( "ERROR: " );
Console::WriteLine( args->Message );
}
// XmlSchemaObjectGenerator
int main()
{
XmlTextReader^ tr = gcnew XmlTextReader( "empty.xsd" );
XmlSchema^ schema = XmlSchema::Read( tr, gcnew ValidationEventHandler( XmlSchemaObjectGenerator::ValidationCallback ) );
schema->ElementFormDefault = XmlSchemaForm::Qualified;
schema->TargetNamespace = "http://www.example.com/Report";
{
XmlSchemaElement^ element = gcnew XmlSchemaElement;
element->Name = "purchaseReport";
XmlSchemaComplexType^ element_complexType = gcnew XmlSchemaComplexType;
XmlSchemaSequence^ element_complexType_sequence = gcnew XmlSchemaSequence;
{
XmlSchemaElement^ element_complexType_sequence_element = gcnew XmlSchemaElement;
element_complexType_sequence_element->Name = "region";
element_complexType_sequence_element->SchemaTypeName = gcnew XmlQualifiedName( "String*","http://www.w3.org/2001/XMLSchema" );
{
XmlSchemaKeyref^ element_complexType_sequence_element_keyref = gcnew XmlSchemaKeyref;
element_complexType_sequence_element_keyref->Name = "dummy2";
element_complexType_sequence_element_keyref->Selector = gcnew XmlSchemaXPath;
element_complexType_sequence_element_keyref->Selector->XPath = "r:zip/r:part";
{
XmlSchemaXPath^ field = gcnew XmlSchemaXPath;
field->XPath = "@number";
element_complexType_sequence_element_keyref->Fields->Add( field );
}
element_complexType_sequence_element_keyref->Refer = gcnew XmlQualifiedName( "pNumKey","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 = gcnew XmlSchemaAttribute;
element_complexType_attribute->Name = "periodEnding";
element_complexType_attribute->SchemaTypeName = gcnew XmlQualifiedName( "date","http://www.w3.org/2001/XMLSchema" );
element_complexType->Attributes->Add( element_complexType_attribute );
}
element->SchemaType = element_complexType;
{
XmlSchemaKey^ element_key = gcnew XmlSchemaKey;
element_key->Name = "pNumKey";
element_key->Selector = gcnew XmlSchemaXPath;
element_key->Selector->XPath = "r:parts/r:part";
{
XmlSchemaXPath^ field = gcnew XmlSchemaXPath;
field->XPath = "@number";
element_key->Fields->Add( field );
}
element->Constraints->Add( element_key );
}
schema->Items->Add( element );
}
schema->Write( Console::Out );
return 0;
} // main
};
using System;
using System.Collections;
using System.IO;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Schema;
public class XmlSchemaObjectGenerator {
private static void ValidationCallback(object sender, ValidationEventArgs args ){
if(args.Severity == XmlSeverityType.Warning)
Console.Write("WARNING: ");
else if(args.Severity == XmlSeverityType.Error)
Console.Write("ERROR: ");
Console.WriteLine(args.Message);
}
public static void Main() {
XmlTextReader tr = new XmlTextReader("empty.xsd");
XmlSchema schema = XmlSchema.Read(tr, new ValidationEventHandler(ValidationCallback));
schema.ElementFormDefault = XmlSchemaForm.Qualified;
schema.TargetNamespace = "http://www.example.com/Report";
{
XmlSchemaElement element = new XmlSchemaElement();
element.Name = "purchaseReport";
XmlSchemaComplexType element_complexType = new XmlSchemaComplexType();
XmlSchemaSequence element_complexType_sequence = new XmlSchemaSequence();
{
XmlSchemaElement element_complexType_sequence_element = new XmlSchemaElement();
element_complexType_sequence_element.Name = "region";
element_complexType_sequence_element.SchemaTypeName =
new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")
;
{
XmlSchemaKeyref element_complexType_sequence_element_keyref = 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";
{
XmlSchemaXPath field = new XmlSchemaXPath();
field.XPath = "@number";
element_complexType_sequence_element_keyref.Fields.Add(field);
}
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);
}
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 = "periodEnding";
element_complexType_attribute.SchemaTypeName =
new XmlQualifiedName("date", "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 = "pNumKey";
element_key.Selector = new XmlSchemaXPath();
element_key.Selector.XPath = "r:parts/r:part";
{
XmlSchemaXPath field = new XmlSchemaXPath();
field.XPath = "@number";
element_key.Fields.Add(field);
}
element.Constraints.Add(element_key);
}
schema.Items.Add(element);
}
schema.Write(Console.Out);
}/* Main() */
}
//XmlSchemaObjectGenerator
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
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
End Class
' Main()
'XmlSchemaObjectGenerator
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>
Remarks
Specifies that an attribute or element value (or set of values) has a correspondence with those of the specified key or unique element. The constraint name must be unique within a schema.
Constructors
| XmlSchemaKeyref() |
Initializes a new instance of the XmlSchemaKeyref class. |
Properties
| Annotation |
Gets or sets the |
| Fields |
Gets the collection of fields that apply as children for the XML Path Language (XPath) expression selector. (Inherited from XmlSchemaIdentityConstraint) |
| Id |
Gets or sets the string id. (Inherited from XmlSchemaAnnotated) |
| LineNumber |
Gets or sets the line number in the file to which the |
| LinePosition |
Gets or sets the line position in the file to which the |
| Name |
Gets or sets the name of the identity constraint. (Inherited from XmlSchemaIdentityConstraint) |
| Namespaces |
Gets or sets the XmlSerializerNamespaces to use with this schema object. (Inherited from XmlSchemaObject) |
| Parent |
Gets or sets the parent of this XmlSchemaObject. (Inherited from XmlSchemaObject) |
| QualifiedName |
Gets the qualified name of the identity constraint, which holds the post-compilation value of the |
| Refer |
Gets or sets the name of the key that this constraint refers to in another simple or complex type. |
| Selector |
Gets or sets the XPath expression |
| SourceUri |
Gets or sets the source location for the file that loaded the schema. (Inherited from XmlSchemaObject) |
| UnhandledAttributes |
Gets or sets the qualified attributes that do not belong to the current schema's target namespace. (Inherited from XmlSchemaAnnotated) |
Methods
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
Applies to
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