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Subject: What is the purpose of the NamespaceSupported element?

The entire description of the NamespaceSupported element currently consists of:

'The NamespaceSupported element identifies any namespace extensions supported by the messaging service implementation. Examples are Security Services Markup Language[S2ML] and Transaction Authority Markup Language[XAML]. For example, support for the S2ML namespace would be defined as follows:

<NamespaceSupported location = "http://www.s2ml.org/s2ml.xsd" version = "0.8">http://www.s2ml.org/s2ml</NamespaceSupported>'

I find the above description rather obscure. It is not clear to me how an implementation would actually makes use of this information. The Messaging Service spec does not refer to any such concept defined in the CPA.

The example in Appendix A shows:

<tp:NamespaceSupported tp:location = "http://ebxml.org/project_teams/transport/messageService.xsd" tp:version="0.98b">http://www.ebxml.org/namespaces/messageService</tp:NamespaceSupported>

<tp:NamespaceSupported tp:location = "http://ebxml.org/project_teams/transport/xmldsig-core-schema.xsd" tp:version="1.0">http://www.w3.org/2000/09/xmldsig</tp:NamespaceSupported>

Is the namespace http://ebxml.org/project_teams/transport/messageService.xsd explicitly identified to show that ebXML Messaging Service is used? Does it hurt if the above namespace is not explicitly identified? Similarly, must the namespace http://ebxml.org/project_teams/transport/xmldsig-core-schema.xsd be explicitly identified if XMLDSIG is used? Isn't it already known that the Messaging Service calls for the use of XMLDSIG for sigining purposes?




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