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Re: [Fwd: SAWSDL]

From: Holger Lausen <holger.lausen@deri.org>
Date: Wed, 13 Dec 2006 09:48:24 +0100
Message-ID: <457FBE58.2030705@deri.org>
To: Laurent Henocque <laurent.henocque@gmail.com>
CC: Jacek Kopecky <jacek.kopecky@deri.org>, SAWSDL public list <public-ws-semann@w3.org>
Hi Laurent,

More info on WSDL components URIs:
http://www.w3.org/TR/wsdl20/#wsdl-iri-references
"This appendix provides a syntax for IRI-references for all components
found in a WSDL 2.0 document." As far as I understood Jacek, there is a
WG defining the same for wsdl1.1 and XSD, but we would need to check this.

With respect to your previous proposal, what I like is that it provides
the potential to help the processor to resolve Resources. A major
problem I suspect when only using external RDF triples is that a
processor might have trouble resolving the document for some given
namespace.

Say you want annotate WSDL A, so you create WSDL B, which simply imports
WSDL A and repeats the components where annotation are requied (or
inlines some RDF). Similar applicable to XSD.

best
  Holger

Laurent Henocque wrote:
> Thanks Holger for pointing out the existence of WSDL WG efforts
> towards identifying specific WSDL elements with URIs and the
> possibility to use RDF triples to bind extra annotations to existing
> elements.
> 
> To some extent, this situation lets our entire work on inlined SAWSDL
> annotations collapse ;-). As I mentioned on the IRC during yesterday's
> telcon, there are strong chances that external annotations become the
> rule, not an exception (comparing with the evolution towards xhtml/css).
> 
> Can  you give more insight on the range of WSDL components that will
> be available through uris, and on when this specification will be
> available? (is it in sync, or more advanced than our work?)
> 
> In addition to what you mentioned, and to give a chance to my previous
> proposal (I don't fight for it, but like its simplicity), may I
> suggest the use of RDF triples to declare "redundant" sawsdl files
> meant to be merged/combined to a reference WSDL
> 
> http://www.w3.org/2002/ws/sawsdl/spec/wsdl/order
> sawsdl:merge
> http://some.other.partial.sawsdl/order
> 
> or maybe the opposite way
> 
> http://some.other.partial.sawsdl/order
> sawdl:mergeAnnotationsInto
> http://www.w3.org/2002/ws/sawsdl/spec/wsdl/order
> 
> and maybe we do not need to introduce another keyword, using
> sawsdl:modelReference to mention that a secondary uri links to a
> (maybe partial) file that provides annotations to the original
> 
> http://www.w3.org/2002/ws/sawsdl/spec/wsdl/order
> sawsdl:modelReference
> http://some.other.partial.sawsdl/order
> 
> I mention this just to illustrate that there might exist a life
> between inlined annotations and component level annotations requiring
> the use of a uri syntax. The user wanting to annotate an existing WSDL
> or SAWSDL may find handy to just download the file, adapt it, and use
> the combination declared using a global RDF triple. (All this without
> officially working on external annotations, hence complying to our
> charter)
> 
> Laurent
> 
> Holger Lausen a écrit :
>> Hi all,
>>
>> after discussing it a while with Jack I think we do not need a specific
>> piece of XML for this purpose. Here the line of argumentation:
>>
>> a) We also need to provide a mechanism to annotate external WSDL files
>> (WSDL import mechanism) this can be either the case if someone
>> implements a specific porttype (interface) defined by someone else or if
>> a third party wants to add some annotations to a WSDL (assuming some
>> kind of registry that adds categorization information).
>>
>> b) thinking about what we want to annotate (especially for the WSDL
>> case) we do want to annotate components (e.g. the "order" operation in
>> the "Order" interface) and not the first "wsdl:operation" occurrence
>> within a "wsdl:interface". In exact we want to say something about
>> components and not about their syntactic encoding.
>>
>> b1) There might be changes to the XML representation of the components
>> that do not change the the meaning of the WSDL (e.g. flipping the order
>> in which operations are defined), but might break a specific xpath
>> statement.
>>
>> b2) WSDL WG is already working on URIs that identify a specific
>> operation (e.g. the "order" operation in the "Order" interface):
>> http://www.w3.org/2002/ws/sawsdl/spec/wsdl/order#wsdl.interface(Order,wsdl.interfaceOperation(order))
>> (or something like this, Jacek will correct me here)
>>
>> Similar to WSDL WG also XML Schema WG defines URI which exactly define
>> components.
>>
>> c) Following this argument, XPath might not be the best way to annotate
>> some external component (WSDL or XSD), instead a URI (component
>> identifier) can be used. This would lead an XML similar to:
>>
>> <sawsdl:externalModelReferene
>> sawsdl:component="http://www.w3.org/2002/ws/sawsdl/spec/wsdl/order#wsdl.interface(Order,wsdl.interfaceOperation(order))"
>> sawsdl:modelReference="http://www.w3.org/2002/ws/sawsdl/spec/ontology/purchaseorder#Order"/>
>>
>> This essentially boils down to annotate a URI with a property. This in
>> turn is exactly what RDF does. Thus we could achieve the same by not
>> defining a new XML Element, but by reusing the RDF syntax we defined,
>> leading to a triple like:
>>
>> http://www.w3.org/2002/ws/sawsdl/spec/wsdl/order#wsdl.interface(Order,wsdl.interfaceOperation(order))
>> sawsdl:modelReference
>> http://www.w3.org/2002/ws/sawsdl/spec/ontology/purchaseorder#Order
>>
>> I would argue for explaining this use of rdf, instead of introducing a
>> new element.
>>
>> best
>>   Holger
>>
>> Jacek Kopecky wrote:
>>> Hi all, Karthik has sent a proposal for external annotations in SAWSDL,
>>> see the attached MS Word document.
>>> Jacek
>>>
>>> -------- Forwarded Message --------
>>> From: Karthik Gomadam <karthik.gomadam@gmail.com>
>>> To: Jacek Kopecky <jacek.kopecky@deri.org>, Amit Sheth @ LSDIS
>>> <amit@cs.uga.edu>
>>> Subject: SAWSDL
>>> Date: Mon, 11 Dec 2006 21:04:57 -0500
>>>
>>> Hi Jack,
>>> Please find the SAWSDL document attached.
>>>
> 

-- 
Holger Lausen

Digital Enterprise Research Institute (DERI)
http://www.deri.org/

Tel:   +43 512 5076464
Mail: holger.lausen@deri.org
WWW: http://holgerlausen.net


Received on Wednesday, 13 December 2006 08:48:45 UTC

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