<wst:RequestSecurityTokenResponseCollection xmlns:wst="http://docs.oasis-open.org/ws-sx/ws-trust/200512">
  <wst:RequestSecurityTokenResponse Context="validatecontext">
    <wst:TokenType>http://docs.oasis-open.org/ws-sx/ws-trust/200512/RSTR/Status</wst:TokenType>
    <wst:Status>
      <wst:Code>http://docs.oasis-open.org/ws-sx/ws-trust/200512/status/invalid</wst:Code>
      <wst:Reason>Validation failure: digital signature is invalid</wst:Reason>
    </wst:Status>
  </wst:RequestSecurityTokenResponse>
</wst:RequestSecurityTokenResponseCollection>