关键词: 数据依赖, 依赖链, 可信评估, 约减规则, 可扩展的BPEL控制流图（XBFG）

Abstract: This paper proposes a data dependency based trust evaluation approach for business process execution language for Web services (BPEL). Firstly, it derives both direct and indirect data dependencies between service components in BPEL processes modeled by extensible BPEL flow graph (XBFG) and constructs dependency links to evaluate the trust values of these service components. Furthermore, on the basis of BPEL structures and XBFG, it proposes reduction rules to evaluate the global trust values of BPEL processes. Experimental results demonstrate that the proposed approach is effective for the trust evaluation of BPEL composite services and stable enough with the growing number of service components in BPEL.

Key words: data dependency, dependency link, trust evaluation, reduction rules, extensible BPEL flow graph (XBFG)