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Web Services have become an integral part of workflow orchestration in scientific applications and many tools used by scientists including Kepler, Taverna and Triana incorporate Web Services. However orchestration of complex workflows that involve services that exploit standards like WS-Addressing or WS-Security are not easily managed by these tools. Most complex use cases that involve "Add on" service standards use implementation specific assumptions, and as a result, the services and workflow composers become tightly coupled. This leads to stove-piped, non-interoperable implementations. This paper describes an effort to implement complex use cases that include asynchronous messaging and WS-Security, for a large application project called LEAD, while maintaining standard conformance and composer simplicity.
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