Issue - 297 - Does correlation require a propertyAlias with messageType attribute?

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Issue - 297 - Does correlation require a propertyAlias with messageType attribute?

Status: received
Date added: 10 Jun 2006
Date submitted: 09 June 2006
Submitter: Mark Ford
Description: I'd like a clarification as to the use of a propertyAlias for message correlation. My reading is that the spec requires a propertyAlias with a messageType in order to extract values for correlation. In cases where an activity like a <receive> uses an elementType variable for its data the spec explains that an anonymous temporary WSDL message variable is created for the data and its single part is used to populate the element variable on the <receive>. The same wording (anonymous temporary WSDL message variable) is used to explain <fromPart> and <toPart> behavior.

If the intent is to allow propertyAlias with elementType then we would need to define which propertyAlias would be used in the case that there was a messageType and an elementType since they could have different queries.

If the intent is to require a propertyAlias with messageType then some additional text to Section 9.2 could make this explicit.
Submitter's proposal:

In Section 9.2, change

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> Observe that in order to retrieve correlation values from a message, a processor needs to apply a particular <propertyAlias>  to the message. In the case in which the application of the <propertyAlias> results in a response that contains anything other than exactly one information item and/or a collection of Character Information Items then a bpel:selectionFailure fault MUST be thrown.

--- to ---

> Observe that in order to retrieve correlation values from a message, a processor MUST apply a <propertyAlias> with a messageType value that matches the QName of the message. In the case in which the application of the <propertyAlias> results in a response that contains anything other than exactly one information item and/or a collection of Character Information Items then a bpel:selectionFailure fault MUST be thrown.

Changes: 10 Jun 2006 - new issue

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