<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header/>
    <SOAP-ENV:Body>
        <samlp:Request xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol" MajorVersion="1" MinorVersion="1" RequestID="_example_request" IssueInstant="TIMESTAMP">
            <samlp:AssertionArtifact>CAS_TICKET</samlp:AssertionArtifact>
        </samlp:Request>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>