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<xs:schema elementFormDefault="qualified"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:tns="http://tempuri.org/complexextension"
           targetNamespace="http://tempuri.org/complexextension">

    <xs:complexType name="ParentType">
        <xs:attribute name="param1" type="xs:string"/>
    </xs:complexType>
    <xs:complexType name="ChildType">
        <xs:complexContent>
            <xs:extension base="tns:ParentType">
                <xs:choice>
                    <xs:element name="param2" type="xs:string"/>
                    <xs:element name="param3" type="xs:int"/>
                </xs:choice>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
    <xs:element name="TestChildElement" type="tns:ChildType"/>
</xs:schema>