samples/SubstitutionGroup/schemas/EasyPo.xsd

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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>