SOA Building Blocks WS-Coordination

WS-Coordination
This specification describes an extensible framework for providing protocols that coordinate the actions of distributed applications. Such coordination protocols are used to support a number of applications, including those that need to reach consistent agreement on the outcome of distributed activities.
The framework defined in this specification enables an application service to create a context needed to propagate an activity to other services and to register for coordination protocols. The framework enables existing transaction processing, workflow, and other systems for coordination to hide their proprietary protocols and to operate in a heterogeneous environment.
Additionally this specification describes a definition of the structure of context and the requirements for propagating context between cooperating services.
 
 Applications use the Activation service to create the coordination context for an activity. Once a coordination context is acquired by an application, it is then sent by whatever appropriate means to another application.  The context contains the necessary information to register into the activity specifying the coordination  behavior that the application will follow. Additionally, an application that receives a coordination context may use the Registration service of the original application or may use one that is specified by an interposing, trusted coordinator. In this manner an arbitrary collection of Web services may coordinate their joint operation.

Readup - OASIS or IBM or Wikipedia

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