XmlSchemaDocumentation Class

Represents the documentation element from XML Schema as specified by the World Wide Web Consortium (W3C). This class specifies information to be read or used by humans within an annotation.

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

public class XmlSchemaDocumentation : XmlSchemaObject
public class XmlSchemaDocumentation extends XmlSchemaObject
public class XmlSchemaDocumentation extends XmlSchemaObject

Information supplied within the XmlSchemaDocumentation class is not used in validation. However, it provides a standardized way to supply information that can be retrieved by tools.

The following example creates the documentation element.

using System;
using System.Xml;
using System.Xml.Schema;

class XMLSchemaExamples
    public static void Main()

        XmlSchema schema = new XmlSchema();

        // <xs:simpleType name="northwestStates">
        XmlSchemaSimpleType simpleType = new XmlSchemaSimpleType();
        simpleType.Name = "northwestStates";

        // <xs:annotation>
        XmlSchemaAnnotation annNorthwestStates = new XmlSchemaAnnotation();
        simpleType.Annotation = annNorthwestStates;

        // <xs:documentation>States in the Pacific Northwest of US</xs:documentation>
        XmlSchemaDocumentation docNorthwestStates = new XmlSchemaDocumentation();
        docNorthwestStates.Markup = TextToNodeArray("States in the Pacific Northwest of US");

        // <xs:restriction base="xs:string">
        XmlSchemaSimpleTypeRestriction restriction = new XmlSchemaSimpleTypeRestriction();
        simpleType.Content = restriction;
        restriction.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");

        // <xs:enumeration value="WA">
        XmlSchemaEnumerationFacet enumerationWA = new XmlSchemaEnumerationFacet();
        enumerationWA.Value = "WA";

        // <xs:annotation>
        XmlSchemaAnnotation annWA = new XmlSchemaAnnotation();
        enumerationWA.Annotation = annWA;

        // <xs:documentation>Washington</documentation>
        XmlSchemaDocumentation docWA = new XmlSchemaDocumentation();
        docWA.Markup = TextToNodeArray("Washington");

        // <xs:enumeration value="OR">
        XmlSchemaEnumerationFacet enumerationOR = new XmlSchemaEnumerationFacet();
        enumerationOR.Value = "OR";

        // <xs:annotation>
        XmlSchemaAnnotation annOR = new XmlSchemaAnnotation();
        enumerationOR.Annotation = annOR;

        // <xs:documentation>Oregon</xs:documentation>
        XmlSchemaDocumentation docOR = new XmlSchemaDocumentation();
        docOR.Markup = TextToNodeArray("Oregon");

        // <xs:enumeration value="ID">
        XmlSchemaEnumerationFacet enumerationID = new XmlSchemaEnumerationFacet();
        enumerationID.Value = "ID";

        // <xs:annotation>
        XmlSchemaAnnotation annID = new XmlSchemaAnnotation();
        enumerationID.Annotation = annID;

        // <xs:documentation>Idaho</xs:documentation>
        XmlSchemaDocumentation docID = new XmlSchemaDocumentation();
        docID.Markup = TextToNodeArray("Idaho");

        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.ValidationEventHandler += new ValidationEventHandler(ValidationCallbackOne);

        XmlSchema compiledSchema = null;

        foreach (XmlSchema schema1 in schemaSet.Schemas())
            compiledSchema = schema1;

        XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable());
        nsmgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema");
        compiledSchema.Write(Console.Out, nsmgr);

    public static void ValidationCallbackOne(object sender, ValidationEventArgs args)

    public static XmlNode[] TextToNodeArray(string text)
        XmlDocument doc = new XmlDocument();
        return new XmlNode[1] {


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

<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xs:simpleType name="northwestStates">
			<xs:documentation>States in the Pacific Northwest of US</xs:documentation>
		<xs:restriction base="xs:string">
		  <xs:enumeration value="WA">
		  <xs:enumeration value="OR">
		  <xs:enumeration value="ID">


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 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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