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	Copyright 2004 The Apache Software Foundation
	
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at
	
	http://www.apache.org/licenses/LICENSE-2.0
	
	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
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<xs:schema targetNamespace="http://xmlbeans.apache.org/samples/substitutiongroup/easypo"
	xmlns:xs="http://www.w3.org/2001/XMLSchema" 
	xmlns:po="http://xmlbeans.apache.org/samples/substitutiongroup/easypo"
	elementFormDefault="qualified">

	<xs:element name="purchase-order">
		<xs:complexType>
			<xs:sequence>
				<xs:element ref="po:invoice-header" minOccurs="1" maxOccurs="unbounded" />
			</xs:sequence>
		</xs:complexType>
	</xs:element>

	<xs:element name="invoice-header">
		<xs:complexType>
			<xs:sequence>
				<xs:element name="ship-to" type="po:name-address" />
				<xs:element name="bill-to" type="po:name-address" />
				<xs:element ref="po:product" minOccurs="0" />
				<xs:element ref="po:comment" minOccurs="0" />
			</xs:sequence>
		</xs:complexType>
	</xs:element>

	<xs:complexType name="name-address">
		<xs:sequence>
			<xs:element name="name" type="xs:string" />
			<xs:element name="address" type="xs:string" />
		</xs:sequence>
	</xs:complexType>

	<xs:complexType name="product-type" abstract="true">
		<xs:attribute name="id" type="xs:int" />
	</xs:complexType>

	<xs:complexType name="book-type">
		<xs:complexContent>
			<xs:extension base="po:product-type">
				<xs:sequence>
					<xs:element name="title" type="xs:string" />
				</xs:sequence>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:complexType name="clothing-type">
		<xs:complexContent>
			<xs:extension base="po:product-type">
				<xs:sequence>
					<xs:element name="color">
						<xs:simpleType>
							<xs:restriction base="xs:token">
								<xs:enumeration value="red" />
								<xs:enumeration value="blue" />
								<xs:enumeration value="green" />
							</xs:restriction>
						</xs:simpleType>
					</xs:element>
				</xs:sequence>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="product" type="po:product-type" abstract="true" />

	<xs:element name="book" type="po:book-type" substitutionGroup="po:product" />
	<xs:element name="clothing" type="po:clothing-type" substitutionGroup="po:product" />

	<xs:element name="comment" type="xs:string" />
	<xs:element name="ship-comment" type="xs:string" substitutionGroup="po:comment" />
	<xs:element name="bill-comment" type="xs:string" substitutionGroup="po:comment" />

</xs:schema>
