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JONATHAN LEE, YING-YAN LIN, SHANG-PIN MA AND SHIN-JIE LEE
Department of Computer Science and Information Engineering
National Central University
Chungli, 320 Taiwan
Web service technologies are best exploited by composing services, and BPEL
(Web Services Business Process Execution Language) is adopted industrial-wide as the
de facto service composition standard. However, a BPEL composite service is typically
treated as a fully automated service flow that orchestrates multiple web services and involves
no user interactions ¡V a desirable feature for service delivery, and is presently not
included in the BPEL standard. In this work, we propose an extension to BPEL to infuse
user interactions into composite services along three dimensions: (1) to develop two
BPEL extension activities to describe the inner workings of user interactions in BPEL
service and the rendering of service user interfaces; (2) to provide a wizard-style mechanism
to guide the user to interact with the service flow in accordance with the sequence
of service execution; and (3) to devise a UI service communication protocol to facilitate
secure cross-domain communication among UI services from various domains. An enhanced
BPEL engine with a service UI rendering engine has been accordingly developed.
Received November 17, 2008; accepted December 4, 2008.
Communicated by Jonathan Lee, Wei-Tek Tsai and Yau-Hwang Kuo.
* This work was supported by the National Science Council of Taiwan, R.O.C. under grant No. NSC 97-2631-
H-008-001.