XmlSchemaAttribute Class

Represents the attribute element from the XML Schema as specified by the World Wide Web Consortium (W3C). Attributes provide additional information for other document elements. The attribute tag is nested between the tags of a document's element for the schema. The XML document displays attributes as named items in the opening tag of an element.

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

public class XmlSchemaAttribute : XmlSchemaAnnotated
public class XmlSchemaAttribute extends XmlSchemaAnnotated
public class XmlSchemaAttribute extends XmlSchemaAnnotated

Attribute declarations can be present as child elements of the schema element (having global scope) or within complex type definitions. For complex types, attribute declarations can be present as local declarations or references to attributes with global scope. Both global and local attribute declarations have the optional type attribute that refers to an existing simple type. If the optional type attribute is not used, the attribute declaration (global or local) must define a local simple type.

The following example creates the attribute element.

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

class XMLSchemaExamples
    public static void Main()

        XmlSchema schema = new XmlSchema();

        // <xs:attribute name="mybaseattribute">
        XmlSchemaAttribute attributeBase = new XmlSchemaAttribute();
        attributeBase.Name = "mybaseattribute";

        // <xs:simpleType>
        XmlSchemaSimpleType simpleType = new XmlSchemaSimpleType();
        attributeBase.SchemaType = simpleType;

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

        // <xs:maxInclusive value="1000"/>
        XmlSchemaMaxInclusiveFacet maxInclusive = new XmlSchemaMaxInclusiveFacet();
        maxInclusive.Value = "1000";

        // <xs:complexType name="myComplexType">
        XmlSchemaComplexType complexType = new XmlSchemaComplexType();
        complexType.Name = "myComplexType";

        // <xs:attribute ref="mybaseattribute"/>
        XmlSchemaAttribute attributeBaseRef = new XmlSchemaAttribute();
        attributeBaseRef.RefName = new XmlQualifiedName("mybaseattribute");

        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)


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:attribute name="mybaseattribute">
            <xs:restriction base="xs:integer">
                <xs:maxInclusive value="1000" />
    <xs:complexType name="myComplexType">
        <xs:attribute ref="mybaseattribute" />

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