[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] RBAC  RBAC (role-based access control)  RDF     (Resource Description Framework)      relating to Web services  realms  recognitions  redundancy  referencing     data  registering     tModel data structures  registries      UDDI         publishing business information to  2nd  3rd  4th  5th  6th  7th          publishing service information to  2nd  3rd  4th  5th  6th  7th  8th  9th  registries.  [See service registries] registry requirements     (UDDI)  reliability     messaging  2nd  3rd  4th  5th  6th  7th  8th  9th  10th  11th  12th  13th  Remote Method Invocation over Internet Inter-ORB (RMI-IIOP)  Remote Procedure Call (RPC)  Remote Procedure Calls.  [See RPCs] repositories     certificates      WSDL  request messages      EMail headers  request-response cycle  request-response cylcle     centralized model      peer model  request-response style of operations  2nd  Resource Description Framework.  [See RDF] resources  response messages  restrictions     (schema reusability)      xsi(colon)type  reusability     XML Schemas          advanced reusability          attribute groups          content model groups          design principles          element references          extensions and restrictions  2nd  3rd  4th  5th          include and import mechanisms  2nd  3rd  4th  5th  RMI-IIOP (Remote Method Invocation over Internet Inter-ORB)  role-based access control (RBAC)  role-based control  roles     descriptions  2nd      service descriptions  routers     TCP  RPC (Remote Procedure Call)  RPCDispatcher  RPCs     (Remote Procedure Calls)      alternatives      invoking      SOAP-based  2nd      vs. messaging  2nd  3rd  4th  RR-DNS (Round-Robin Domain Name Service)