Q-R 
      ReferenceList element 
  defined, 116 
  example, 123 
  overview, 123 
     ReferenceProperties element, 78 
     referral cache, 95, 96, 97, 99 
      referral registration, 9395 
     referral statements, 9091, 96, 99100 
     Register request message, 180, 181 
     RegisterResponse message, 180 
     registration service 
  in coordination context, 177 
  defined, 176 
  enrolling Web services, 180181 
      ReplyTo element, 79, 80, 85 
     RequestedProofToken WSE class, 207 
     RequestedSecurityToken WSE class, 207 
     RequestEncryption element, 200 
     RequestKeySize element, 200 
     RequestKeyType element, 200 
     RequestProofEncryption element, 200 
     request-response messaging, 76 
     RequestSecurityToken message, 195197, 210 
     RequestSecurityToken WSE class, 207 
     RequestSecurityTokenResponse message, 197198, 199, 206, 212213 
     RequestSecurityTokenResponse WSE class, 207 
     RequestSignatureAlgorithm element, 200 
     RequestSoapContext object, 43 
     RequestSoapContext.Current property, 43 
     RequestTokenRequestResponse message, 204 
     ResponseSoapContext object, 44 
      routing.  See  WS-Routing specification