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XmlSchema Class

An in-memory representation of an XML Schema as specified in the World Wide Web Consortium (W3C) XML Schema Part 1: Structures and XML Schema Part 2: Datatypes specifications.

Namespace: System.Xml.Schema
Assembly: System.Xml (in system.xml.dll)

public ref class XmlSchema : public XmlSchemaObject
public class XmlSchema extends XmlSchemaObject
public class XmlSchema extends XmlSchemaObject
Not applicable.

Security noteSecurity Note:

Exceptions raised as a result of using the XmlSchema class, such as the XmlSchemaException class may contain sensitive information that should not be exposed in untrusted scenarios. For example, the SourceUri property of an XmlSchemaException returns the URI path to the schema file that caused the exception. The SourceUri property should not be exposed in untrusted scenarios. Exceptions should be properly handled so that this sensitive information is not exposed in untrusted scenarios.

The following example creates a schema definition.

#using <mscorlib.dll>
#using <System.Xml.dll>

using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;

class XmlSchemaExamples
	static void Main()

		XmlSchema^ schema = gcnew XmlSchema();

		// <xs:element name="cat" type="xs:string"/>
		XmlSchemaElement^ elementCat = gcnew XmlSchemaElement();
		elementCat->Name = "cat";
		elementCat->SchemaTypeName = gcnew XmlQualifiedName("string", "");

		// <xs:element name="dog" type="xs:string"/>
		XmlSchemaElement^ elementDog = gcnew XmlSchemaElement();
		elementDog->Name = "dog";
		elementDog->SchemaTypeName = gcnew XmlQualifiedName("string", "");

		// <xs:element name="redDog" substitutionGroup="dog" />
		XmlSchemaElement^ elementRedDog = gcnew XmlSchemaElement();
		elementRedDog->Name = "redDog";
		elementRedDog->SubstitutionGroup = gcnew XmlQualifiedName("dog");

		// <xs:element name="brownDog" substitutionGroup ="dog" />
		XmlSchemaElement^ elementBrownDog = gcnew XmlSchemaElement();
		elementBrownDog->Name = "brownDog";
		elementBrownDog->SubstitutionGroup = gcnew XmlQualifiedName("dog");

		// <xs:element name="pets">
		XmlSchemaElement^ elementPets = gcnew XmlSchemaElement();
		elementPets->Name = "pets";

		// <xs:complexType>
		XmlSchemaComplexType^ complexType = gcnew XmlSchemaComplexType();
		elementPets->SchemaType = complexType;

		// <xs:choice minOccurs="0" maxOccurs="unbounded">
		XmlSchemaChoice^ choice = gcnew XmlSchemaChoice();
		complexType->Particle = choice;
		choice->MinOccurs = 0;
		choice->MaxOccursString = "unbounded";

		// <xs:element ref="cat"/>
		XmlSchemaElement^ catRef = gcnew XmlSchemaElement();
		catRef->RefName = gcnew XmlQualifiedName("cat");

		// <xs:element ref="dog"/>
		XmlSchemaElement^ dogRef = gcnew XmlSchemaElement();
		dogRef->RefName = gcnew XmlQualifiedName("dog");

		XmlSchemaSet^ schemaSet = gcnew XmlSchemaSet();
		schemaSet->ValidationEventHandler += gcnew ValidationEventHandler(ValidationCallbackOne);

		XmlSchema^ compiledSchema;

		for each (XmlSchema^ schema1 in schemaSet->Schemas())
			compiledSchema = schema1;

		XmlNamespaceManager^ nsmgr = gcnew XmlNamespaceManager(gcnew NameTable());
		nsmgr->AddNamespace("xs", "");
		compiledSchema->Write(Console::Out, nsmgr);

	static void ValidationCallbackOne(Object^ sender, ValidationEventArgs^ args)

int main()
	return 0;

The following XML file is generated for the preceding code example.

<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:xs="">
    <xs:element name="cat" type="xs:string"/>
    <xs:element name="dog" type="xs:string"/>
    <xs:element name="redDog" type="xs:string" substitutionGroup="dog"/>
    <xs:element name="brownDog" type="xs:string" substitutionGroup ="dog" />

    <xs:element name="pets">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element ref="cat"/>
          <xs:element ref="dog"/>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0