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

    <xs:element name="TestAbstract1" type="tns:TestAbstract2"/>
    <xs:complexType name="TestAbstract2" abstract="true">
        <xs:sequence>
            <xs:element name="param1" type="xs:string"/>
        </xs:sequence>
    </xs:complexType>
</xs:schema>