<!-- From https://en.wikipedia.org/wiki/SAML_2.0#SP_Redirect_Request;_IdP_POST_Response -->
<samlp:ArtifactResolve
    xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
    ID="identifier_1"
    Version="2.0"
    IssueInstant="2004-12-05T09:21:58Z"
    Destination="https://sp.example.com/SAML2/ArtifactResolution">
    <saml:Issuer>https://idp.example.org/SAML2</saml:Issuer>
    <!-- an ArtifactResolve message SHOULD be signed -->
    <ds:Signature
      xmlns:ds="http://www.w3.org/2000/09/xmldsig#">...</ds:Signature>
    <samlp:Artifact>''artifact_1''</samlp:Artifact>
  </samlp:ArtifactResolve>