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Subject: Issue - 87 - Optional SOAP Headers

This issue has been added to the wsbpel issue list. The issues list is posted as a Technical Committee document to the OASIS WSBPEL TC pages on a regular basis. The current edition, as a TC document, is the most recent document with the title in the "Issues" folder of the WSBPEL TC document list - the next posting will include this issue. The list editor's working copy, which will normally include an issue when it is announced, is available at this constant URL.

Issue - 87 - Optional SOAP Headers

Status: open
Date added: 27 Nov 2003
Submitter: Yaron Goland
Date submitted: 26 November 2003
Document: Main BPEL Doc
Description: A key feature of the SOAP messaging model is the concept of intermediaries and the ability of intermediaries to insert headers into SOAP messages as they are routed. A direct consequence of this model is that SOAP messages may contain optional headers, that is, headers that sometimes are included in the message and sometimes not. BPEL processes need access to these optional headers because these headers often contain application relevant information, especially in the case where application (as opposed to infrastructure) intermediaries are involved.

Unfortunately WSDL does not define how one should specify an optional message part in an abstract definition. To resolve this ambiguity and to fully support SOAP it is necessary for BPEL to introduce a mechanism that allows the BPEL process to specify that a particular message part in an abstract message definition is optional.
Changes: 27 Nov 2003 - new issue

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