The timeline shows that we already had executable process languages with the web services flow language (WSFL) by IBM and the XLANG specification by Microsoft.
The Business Process Execution Language for Web Services (BPEL4WS) represents the merging of WSFL and XLANG, and with luck, will become the basis of a standard for web service composition.
Web 服务的业务流程执行语言(BPEL4WS)是 WSFL 和 XLANG 融合的产物,如果运气好的话,它将成为 Web 服务整合标准的基础。