samples/AbstractTypes/schemas/myfigures.xsd

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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="Figures" xmlns:a="AbstractFigures" xmlns:f="Figures">

    <xs:import namespace="AbstractFigures"/>
    <xs:complexType name="circle">
        <xs:complexContent>
            <xs:extension base="a:shape">
                <xs:sequence>
                    <xs:element name="radius" type="xs:double"/>
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
    <xs:complexType name="square">
        <xs:complexContent>
            <xs:extension base="a:shape">
                <xs:sequence>
                    <xs:element name="side" type="xs:double"/>
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

</xs:schema>