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Subject: Fw: SPML Roadmap
----- Forwarded by Gearard Woods/Irvine/IBM on 07/23/2003 01:10 PM -----
|---------+---------------------------->
| | Gearard Woods |
| | |
| | 07/23/2003 10:48 |
| | AM |
|---------+---------------------------->
>------------------------------------------------------------------------------------------------------------------------------|
| |
| To: "Elron, Rami" <rami_elron@bmc.com> |
| cc: provision@lists.oasis-open.org, "Elron, Rami" <rami_elron@bmc.com> |
| From: Gearard Woods/Irvine/IBM@IBMUS |
| Subject: RE: SPML Roadmap (Document link: Gearard Woods) |
>------------------------------------------------------------------------------------------------------------------------------|
Rami,
Thanks for the document. I'm afraid that it doesn't address my concerns
though and I think you might be underestimating the coupling between the
schema and the data model. If you are suggesting that an XML Schema
document could be referenced by an SPML schema, then the SPML is obliged to
allow instances of structures defined in that schema to be transported.
Let's remain with the Liberty user profile and get very specific about what
the schema would look like and how the schema impacts the data model. To
extend your example, I imagine that you are suggesting that the Liberty
schema be referenced like this:
<schema>
<objectClassDefinition name="LibertyPersonalProfile">
<superiorClasses>
<objectClassDefinitionReference name="Complex">
<schemaIdentifier
schemaIDType="urn:oasis:names:tc:SPML:1:0#GenericString">
<schemaID>http://www.projectliberty.org/specs/lib-svc-id-pp.xsd</schemaID>
</schemaIdentifier>
</objectClassDefinitionReference>
</superiorClasses>
</objectClassDefinition>
</schema>
This raises a number of questions:
1. How is the element inside the schema document identified? I'm
interested only in the IDPP element. I disagree with the suggestion that
specific names be reserved by the way, this seems cumbersome and esentially
turns the name into something else.
2. Imagining that I do identify the portion of the schema that I'm
interested in, how do I use it? In your document you say that "While the
definition may seem to imply reliance on a simple attribute/value model, it
can actually leverage this very model to take advantage of much more
complex data structures." If this is true, what would the add request look
like based on the external schema? What about a modify request? These both
require an attribute/value model so I'm having some difficulty
understanding how the XML Schema would relate to the actual request data.
If you could show me specifically what the request XML would look like in
both cases I'd be obliged.
3. If the SPML really can actually consume XML Schema, why define a
separate, SPML-specific, schema language?
Gerry
|---------+---------------------------->
| | "Elron, Rami" |
| | <rami_elron@bmc.c|
| | om> |
| | |
| | 07/23/2003 08:51 |
| | AM |
|---------+---------------------------->
>------------------------------------------------------------------------------------------------------------------------------|
| |
| To: Gearard Woods/Irvine/IBM@IBMUS, provision@lists.oasis-open.org |
| cc: "Elron, Rami" <rami_elron@bmc.com> |
| Subject: RE: SPML Roadmap |
>------------------------------------------------------------------------------------------------------------------------------|
Hi Gerry,
The attached document addresses and hopefully answers your concerns.
If you have any further questions or remarks regarding this document or the
roadmap document, please do not hesitate to call me.
Best regards,
Rami.
----------------------------------------------------------------------------
---------
Rami Elron
Senior System Architect
Security Business Unit
BMC Software Ltd.
Tel: 972 3 766 2434
Fax: 972 3 645 1100
Mobile: 972 64 286 434
email: rami_elron@bmc.com
-----Original Message-----
From: Gearard Woods [mailto:gewoods@us.ibm.com]
Sent: Wednesday, July 23, 2003 12:22 AM
To: rami_elron@bmc.com; provision@lists.oasis-open.org
Subject: SPML Roadmap
Rami,
Further to the call yesterday, I wanted to clarify one of the major
problems that I have with the SPML as it stands and to get your feedback on
how the problem might be solved either with today's approach or with
features that are on the roadmap. Fundamentally, I believe that the schema
language introduced by the current SPML is too restrictive and reflects a
data model that will not be able to satisfy my immediate needs to transport
complex XML data. In fact, I have difficulty seeing how a roadmap built on
this schema language can be made to fit my requirements in the long run.
As an example, could you explain to me how I might use the SPML in the
simple scenario where I have a service (a Web Service) that I wish to
provision which requires the user information to be provided using the
Liberty Alliance user profile
(http://www.projectliberty.org/specs/lib-svc-id-pp.xsd)? This is not an
outlandish scenario by any means, and you could substitute other user
representations such the ebXML UserType for example. Obviously, since the
SPML cannot support XML Schema, I have to think that publishing the schema
for such a service might be problematic. It also seems difficult, given
the attribute/value data model in the current SPML, to communicate an
instance of one of these structures. If you can reassure me that this is
in fact quite seamless and simple in the current SPML, or your roadmap
answers this concern, I would be very grateful.
Thanks,
Gerry
#### Response to SPML Roadmap concerns.doc has been removed from this note
on July 23, 2003 by Gearard Woods
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