- From: Doug Davis <dug@us.ibm.com>
- Date: Wed, 20 Jan 2010 07:35:13 -0500
- To: public-ws-resource-access@w3.org
- Message-ID: <OFA3FC96B9.A7FF47B7-ON852576B0.00681839-852576B1.00452727@us.ibm.com>
To illustrate why this might be needed, take a metadata resource, EPR0, that has as its representation a mex:Metadata document: EPR0.transfer.Get(): <mex:Metadata attr='foo'> list of <metadataSection>s #0 </mex:Metadata> This would appear in an EPR like this: <wsa:EndpointReference> <wsa:Address> ... </wsa:Address> <wsa:Metadata> <mex:Metadata attr='foo'> list of <metadataSections>s #0 </mex:Metadata> </wsa:Metadata> </wsa:EndpointReference> Now change it slightly. Start with a Metadata resource, EPR1, that has as its representation a mex:Metadata document: EPR1.transfer:Get(): <mex:Metadata attr='foo1'> list of <metadataSection>s #1 </mex:Metadata> Add a 2nd (different) Metadata resource, EPR2, that is associated with (ie. is metadata for) the same service: EPR2.transfer:Get(): <mex:Metadata attr='foo2'> list of <metadataSection>s #2 </mex:Metadata> These would appear in an EPR for that service like this: <wsa:EndpointReference> <wsa:Address> ... </wsa:Address> <wsa:Metadata> <mex:Metadata attr='foo1'> list of <metadataSections>s #1 </mex:Metadata> <mex:Metadata attr='foo2'> list of <metadataSections>s #2 </mex:Metadata> </wsa:Metadata> </wsa:EndpointReference> If we forced people to merge these two into one mex:Metadata element/document then we would lose the ability for someone to extend the mex:Metadata element as shown in the above example - what's the value of 'attr' supposed to be? And we lose any implicit meaning that might have been implied by the grouping that was established - as defined by whoever did the grouping. In short, people should be able to define their metadata in whatever form they want. thanks -Doug ______________________________________________________ STSM | Standards Architect | IBM Software Group (919) 254-6905 | IBM 444-6905 | dug@us.ibm.com The more I'm around some people, the more I like my dog. Ram Jeyaraman <Ram.Jeyaraman@microsoft.com> 01/19/2010 12:41 PM To Doug Davis/Raleigh/IBM@IBMUS, Asir Vedamuthu <asirveda@microsoft.com> cc "public-ws-resource-access@w3.org" <public-ws-resource-access@w3.org> Subject RE: [Bug 8205] New: MEX: can mex appear more than once in an EPR It is not clear to me why a service would include more than one <mex:metadata> element inside the <wsa:metadata> element, since the service could already include multiple <mex:medatasection> elements within <mex:metadata>. Using a single <mex:metadata> wrapper provides a simple and less-confusing processing model to the client. If the concern is that the xs:any inside the <wsa:metadata> allows using more than one <mex:metadata> element, then the specification could fix the problem by explicitly limiting the number of <mex:metadata> element to at most one. For example, WS-Transfer limits the content as follow [1]. How about [2] that explicitly limits the number of <mex:metadata> elements to at most one? [1] http://www.w3.org/2002/ws/ra/edcopies/wst.html#Put The Put request message MUST be of the following form: [Action] http://www.w3.org/2009/09/ws-tra/Put [Body] <wst:Put Dialect="xs:anyURI"? ...> xs:any* </wst:Put> The following describes additional, normative constraints on the outline listed above: [Body]/wst:Put This REQUIRED element MUST have as its first child element, an element that comprises the representation of the resource that is to be replaced. [2] http://www.w3.org/2002/ws/ra/snapshots/20091117/wsmex.html#Metadata-in-Endpoint-References /wsa:EndpointReference/wsa:Metadata/mex:Metadata A unique mex:Metadata element appearing as a direct child of the wsa:Metadata endpoint reference element. No more than one mex:Metadata element MUST be present as a child of the wsa:Metadata endpoint reference element. From: public-ws-resource-access-request@w3.org [mailto:public-ws-resource-access-request@w3.org] On Behalf Of Asir Vedamuthu Sent: Tuesday, December 15, 2009 9:03 AM To: Doug Davis Cc: public-ws-resource-access@w3.org Subject: RE: [Bug 8205] New: MEX: can mex appear more than once in an EPR Clarification sounds good. From: Doug Davis [mailto:dug@us.ibm.com] Sent: Tuesday, December 15, 2009 5:14 AM To: Asir Vedamuthu Cc: public-ws-resource-access@w3.org Subject: RE: [Bug 8205] New: MEX: can mex appear more than once in an EPR On the contrary, it clarifies whether more than one mex element can appear and what it means - which was the point of the issue. thanks -Doug ______________________________________________________ STSM | Standards Architect | IBM Software Group (919) 254-6905 | IBM 444-6905 | dug@us.ibm.com The more I'm around some people, the more I like my dog. Asir Vedamuthu <asirveda@microsoft.com> Sent by: public-ws-resource-access-request@w3.org 12/14/2009 09:52 PM To Doug Davis/Raleigh/IBM@IBMUS, "public-ws-resource-access@w3.org" < public-ws-resource-access@w3.org> cc Subject RE: [Bug 8205] New: MEX: can mex appear more than once in an EPR It sounds like that the change proposal does not offer any additional value to WS-MetadataExchange users. Suggest that we keep it simple and add additional text to tighten the specification to everyone?s satisfaction. Regards, Asir S Vedamuthu Microsoft Corporation From: Doug Davis [mailto:dug@us.ibm.com] Sent: Monday, December 14, 2009 6:04 PM To: Asir Vedamuthu Cc: public-ws-resource-access@w3.org Subject: RE: [Bug 8205] New: MEX: can mex appear more than once in an EPR Even without this change multiple mex:MetaData elements can appear since the xs:any could be another mex:metadata element. There is no difference between: <mex:Metadata> <mex:MetadataSection>...data1...</mex:MetadatSection> <mex:MetadataSection>...data2...</mex:MetadatSection> </mex:Metadata> and <mex:Metadata> <mex:MetadataSection>...data1...</mex:MetadatSection> </mex:Metadata> <mex:Metadata> <mex:MetadataSection>...data2...</mex:MetadatSection> </mex:Metadata> We don't need to say anything about the relationship because there isn't one. thanks -Doug ______________________________________________________ STSM | Standards Architect | IBM Software Group (919) 254-6905 | IBM 444-6905 | dug@us.ibm.com The more I'm around some people, the more I like my dog. Asir Vedamuthu <asirveda@microsoft.com> Sent by: public-ws-resource-access-request@w3.org 12/14/2009 08:26 PM To "public-ws-resource-access@w3.org" <public-ws-resource-access@w3.org> cc Subject RE: [Bug 8205] New: MEX: can mex appear more than once in an EPR ><mex:Metadata> xs:any* </mex:Metadata>? As you can see, the intent is once - a unique mex:Metadata element appearing as a direct child. > Change the ? to a * on mex:Metadata and remove the word "unique" We would like to understand why multiple mex:Metadata elements add value? What is the relationship among such multiple elements? Regards, Asir S Vedamuthu Microsoft Corporation -----Original Message----- From: public-ws-resource-access-notifications-request@w3.org [mailto:public-ws-resource-access-notifications-request@w3.org] On Behalf Of bugzilla@wiggum.w3.org Sent: Thursday, November 05, 2009 9:02 AM To: public-ws-resource-access-notifications@w3.org Subject: [Bug 8205] New: MEX: can mex appear more than once in an EPR http://www.w3.org/Bugs/Public/show_bug.cgi?id=8205 Summary: MEX: can mex appear more than once in an EPR Product: WS-Resource Access Version: FPWD Platform: PC OS/Version: Windows XP Status: NEW Severity: normal Priority: P2 Component: MetadataExchange AssignedTo: public-ws-resource-access-notifications@w3.org ReportedBy: dug@us.ibm.com QAContact: public-ws-resource-access-notifications@w3.org We define wsa:Metadata/mex:Metadata as: -- <wsa:EndpointReference ...> <wsa:Address>xs:anyURI</wsa:Address> <wsa:ReferenceParameters> xs:any* lt;/wsa:ReferenceParameters> ? <wsa:Metadata> <mex:Metadata> xs:any* </mex:Metadata>? xs:any* </wsa:Metadata> ? xs:any* </wsa:EndpointReference> /wsa:EndpointReference/wsa:Metadata/mex:Metadata A unique mex:Metadata element appearing as a direct child of the wsa:Metadata endpoint reference element. -- What not clear is whether or not there can be more than one mex:Metadata element under the wsa:Metadata element since the xs:any could technically include it. I see no reason to ban it. Proposal: Change the ? to a * on mex:Metadata and remove the word "unique". or if we do want to ban it then we need to add some text being explicit about it. -- Configure bugmail: http://www.w3.org/Bugs/Public/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug. You are the assignee for the bug.
Received on Wednesday, 20 January 2010 12:36:04 UTC