Policies describe the capabilities and requirements of a Web Service such as whether and how a message must be secured, whether and how a message must be delivered reliably, and so on.
Oracle Fusion Middleware 11g Release 1 (11.1.1) supports the following types of policies:
WS-ReliableMessaging — Reliable messaging policies that implement the WS-ReliableMessaging standard describe a wire-level protocol that allows guaranteed delivery of SOAP messages and can maintain the order of the sequence in which a set of messages are delivered.
The technology can be used to ensure that messages are delivered in the correct order. If a message is delivered out of order, the receiving system can be configured to guarantee that the messages will be processed in the correct order. The system can also be configured to deliver messages at least once, not more than once, or exactly once. If a message is lost, the sending system re-transmits the message...