XmlSchemaKeyref Class
Definition
Important
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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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