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RE: Question about xs:import

From: Dare Obasanjo <dareo@microsoft.com>
Date: Tue, 24 Sep 2002 12:43:08 -0700
Message-ID: <8BD7226E07DDFF49AF5EF4030ACE0B7E0696F9CB@red-msg-06.redmond.corp.microsoft.com>
To: "Mark Feblowitz" <mfeblowitz@frictionless.com>, <noah_mendelsohn@us.ibm.com>, "Jeni Tennison" <jeni@jenitennison.com>
Cc: <Ryan.Barr@ejgallo.com>, <xmlschema-dev@w3.org>, "Michael Rowell (E-mail)" <mrowell@openapplications.org>

When last I looked we ignore multiple imports and pick only the first
one for a given namespace. 

-- 
PITHY WORDS OF WISDOM 
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This posting is provided "AS IS" with no warranties, and confers no
rights. 

>  
>  
> -----Original Message-----
> From: Mark Feblowitz [mailto:mfeblowitz@frictionless.com] 
> Sent: Tuesday, September 24, 2002 12:18 PM
> To: 'noah_mendelsohn@us.ibm.com'; Jeni Tennison
> Cc: Ryan.Barr@ejgallo.com; xmlschema-dev@w3.org; Michael 
> Rowell (E-mail)
> 
> 
> Hmmm. Multiple schemaLocations for a given import are treated 
> as hints. But are separate schemaLocations in separate 
> imports for the same namespace also intended to be treated as hints?
> 
> As a practical matter, large namespaces are much more 
> managable when defined across several, separate files, 
> especially when users of the definitions from the namespace 
> need only subsets of the definitions. 
> 
> OAGIS 8 has followed this model in implementing its approach 
> to constructing overlays, building overlyay BODs (business 
> object documents) by importing only the sets of definitions 
> that are needed, using separate import statements for each 
> needed set of definitions. This works fine using all 
> available parsers. 
> 
> I certainly hope that developers of these parsers do not 
> decide to start treating subsequent import statements as 
> merely being hints. Then we'd have to build a whole bunch of 
> adaptors in a big hurry!
> 
> Mark
> 
> 
> 
> -----Original Message-----
> From: noah_mendelsohn@us.ibm.com [mailto:noah_mendelsohn@us.ibm.com]
> Sent: Tuesday, September 24, 2002 9:41 AM
> To: Jeni Tennison
> Cc: Ryan.Barr@ejgallo.com; xmlschema-dev@w3.org
> Subject: Re: Question about xs:import
> 
> 
> 
> Actually, I think Jeni's answer is right in practice, but not 
> in theory (and that's rare, she's usually right all around.)  
> schemaLocations are hints.  So if you have two for a given 
> namespace in the instance, your schema processor is free to 
> follow one, the other, both, or neither.  In 
> practice, most processors would follow at most the first.   
> Furthermore, 
> it would be illegal to have conflicting definitions or 
> declarations, so unless you'd carefully written the two 
> documents to be imported together, it's unlikely that 
> processing would proceed without error as the second one was 
> brought in.  I don't believe it's strictly an error to put 
> together schemas for the same namespace from multiple 
> documents, but any uses I can imagine would be highly 
> specialized and would be unlikely to be implemented in the 
> sort of "off the shelf" validators that most of us are using. 
>  Thanks very much.
> 
> ------------------------------------------------------------------
> Noah Mendelsohn                              Voice: 1-617-693-4036
> IBM Corporation                                Fax: 1-617-693-8676
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> 
> 
> 
Received on Tuesday, 24 September 2002 15:44:52 GMT

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