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XmlSchemaSequence Class

Represents the sequence element (compositor) from the XML Schema as specified by the World Wide Web Consortium (W3C). The sequence requires the elements in the group to appear in the specified sequence within the containing element.

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

public class XmlSchemaSequence : XmlSchemaGroupBase
public class XmlSchemaSequence extends XmlSchemaGroupBase
public class XmlSchemaSequence extends XmlSchemaGroupBase

The following example shows the XmlSchemaSequence class.

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

class XMLSchemaExamples
    public static void Main()

        XmlSchema schema = new XmlSchema();

        // <xs:element name="thing1" type="xs:string"/>
        XmlSchemaElement elementThing1 = new XmlSchemaElement();
        elementThing1.Name = "thing1";
        elementThing1.SchemaTypeName = new XmlQualifiedName("string", "");

        // <xs:element name="thing2" type="xs:string"/>
        XmlSchemaElement elementThing2 = new XmlSchemaElement();
        elementThing2.Name = "thing2";
        elementThing2.SchemaTypeName = new XmlQualifiedName("string", "");

        // <xs:element name="thing3" type="xs:string"/>
        XmlSchemaElement elementThing3 = new XmlSchemaElement();
        elementThing3.Name = "thing3";
        elementThing3.SchemaTypeName = new XmlQualifiedName("string", "");

        // <xs:attribute name="myAttribute" type="xs:decimal"/>
        XmlSchemaAttribute myAttribute = new XmlSchemaAttribute();
        myAttribute.Name = "myAttribute";
        myAttribute.SchemaTypeName = new XmlQualifiedName("decimal", "");

        // <xs:group name="myGroupOfThings">
        XmlSchemaGroup myGroupOfThings = new XmlSchemaGroup();
        myGroupOfThings.Name = "myGroupOfThings";

        // <xs:sequence>
        XmlSchemaSequence sequence = new XmlSchemaSequence();
        myGroupOfThings.Particle = sequence;

        // <xs:element ref="thing1"/>
        XmlSchemaElement elementThing1Ref = new XmlSchemaElement();
        elementThing1Ref.RefName = new XmlQualifiedName("thing1");

        // <xs:element ref="thing2"/>
        XmlSchemaElement elementThing2Ref = new XmlSchemaElement();
        elementThing2Ref.RefName = new XmlQualifiedName("thing2");

        // <xs:element ref="thing3"/>
        XmlSchemaElement elementThing3Ref = new XmlSchemaElement();
        elementThing3Ref.RefName = new XmlQualifiedName("thing3");

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

        // <xs:group ref="myGroupOfThings"/>
        XmlSchemaGroupRef myGroupOfThingsRef = new XmlSchemaGroupRef();
        myComplexType.Particle = myGroupOfThingsRef;
        myGroupOfThingsRef.RefName = new XmlQualifiedName("myGroupOfThings");

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

        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", "");
        compiledSchema.Write(Console.Out, nsmgr);

    public static void ValidationCallbackOne(object sender, ValidationEventArgs args)


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

<?xml version="1.0" encoding="IBM437"?>
<xs:schema  xmlns:xs="">
    <xs:element name="thing1" type="xs:string"/>
    <xs:element name="thing2" type="xs:string"/>
    <xs:element name="thing3" type="xs:string"/>

    <xs:attribute name="myAttribute" type="xs:decimal"/>

    <xs:group name="myGroupOfThings">
      <xs:element ref="thing1"/>
      <xs:element ref="thing2"/>
      <xs:element ref="thing3"/>

    <xs:complexType name="myComplexType">
        <xs:group ref="myGroupOfThings"/>
        <xs:attribute ref="myAttribute"/>

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