logout.xsd

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

    <!-- requestType -->
    <xs:complexType name="requestType">
        <xs:attribute name="auto" type="xs:boolean" use="optional"/>
    </xs:complexType>

    <!-- in -->
    <xs:element name="in">
        <xs:complexType>
            <xs:all>
                <xs:element name="request" type="requestType"/>
            </xs:all>
        </xs:complexType>
    </xs:element>

</xs:schema>