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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:xmime="http://www.w3.org/2005/05/xmlmime"
           targetNamespace="http://www.w3.org/2005/05/xmlmime">
    <xs:attribute name="contentType">
        <xs:simpleType>
            <xs:restriction base="xs:string">
                <xs:minLength value="3"/>
            </xs:restriction>
        </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="expectedContentTypes" type="xs:string"/>
    <xs:complexType name="base64Binary">
        <xs:simpleContent>
            <xs:extension base="xs:base64Binary">
                <xs:attribute ref="xmime:contentType"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    <xs:complexType name="hexBinary">
        <xs:simpleContent>
            <xs:extension base="xs:hexBinary">
                <xs:attribute ref="xmime:contentType"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    <xs:element name="TestExtension" type="xmime:base64Binary"/>
</xs:schema>