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Re: XML Schema WG comments on Data Model

From: Norman Walsh <Norman.Walsh@Sun.COM>
Date: Fri, 20 Aug 2004 15:42:22 -0400
To: Sandy Gao <sandygao@ca.ibm.com>
Cc: public-qt-comments@w3.org, w3c-xml-schema-ig@w3.org
Message-id: <87wtztvboh.fsf@nwalsh.com>
/ Sandy Gao <sandygao@ca.ibm.com> was heard to say:
| Dear colleagues:
| 1. Schema-related issues
| 1.1 Types in data models
| 1.1.1 Where are they stored?
| In various places, the draft talks about "types" and properties of these
| types. (An example is in section 6.2.2 and 6.3.2, for accessor
| "dm:string-value".)
| It seems that the word "type" in those places refer to schema type
| definitions, instead of just their "name"s. But it's not entirely clear how
| such type information is available. Element/attribute nodes only have a
| "type" property for the NAME of the type, but not the type itself.
| It's also not clear from the draft how processors get a handle to these
| type definitions (schema components). (From a separate schema loader, from
| PSVI, etc.)
| It "seems" that the intention is:
| - Type definitions are available within DM-compliant processors.
| - There is also a name-to-type mapping (including anonymous type names)
| that's available in such processors.
| - Such information is internal to the DM, and is not exposed to
| applications that use the DM. (Which explains why there are no accessors to
| expose real types.)
| - Schemas (or schema components) are somehow "imported" by DM processors.
| How they are imported is not defined in DM spec. Other specs or
| implementations can have their own ways to implement such importing.
| If the above is correct, then there should be some notes to make it clear.

We believe that the 23 July 2004 WD[1] addresses these concerns. Could
you please let us know if you agree or disagree?

                                        Be seeing you,

[1] http://www.w3.org/TR/2004/WD-xpath-datamodel-20040723/

Norman.Walsh@Sun.COM / XML Standards Architect / Sun Microsystems, Inc.
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Received on Friday, 20 August 2004 19:42:41 UTC

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