A framework for ensuring consistency of Web Services Transactions based on WS-BPEL

(9-11) . These specifications provide transaction support in loose coupling environment by relaxing ACID properties of traditional transaction. BTP adopt the two-phase commit protocol to ensure the consistency of the transaction, but it's not very ideal in practice because its centralization management and it doesn't support traditional ACID transaction. The WS-Transaction describes an extensible framework for divorcing the coordination framework and coordination type. But two kind coordination types that are proposed lack of implementation of concrete coordinate process. WS-CAF has certain advantage compare with the former two specifications. It is similar to WS-Transaction, but more completed, however, the WS-CAF has not adopted by any system recently. WS-BPEL is a mainstream web service composition description language and has become a standard description language. WS-BPEL relied on WSDL is defined as an process-oriented service composition language based on XML ,and is formulated into a norm for web service composition. It can not only implement combination, interaction and presentation process between web services but also WS-BPEL process itself is exposed as a WSDL-defined services and can be called by other web services. The core concept of WS-BPEL is active, that is a statement or a step in the implementation during the WS- BPEL process.The activity of BPEL is divided into atomic activity and structured activity. The atomic activity such as invoke, reply,receive,assign and so on ,which is used for calling a partner web service and the structured activities such as scope, sequence, flow