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Re: XQuery value comparisons (Part I - numerics)

From: Bijan Parsia <bparsia@isr.umd.edu>
Date: Tue, 19 Apr 2005 12:35:22 -0400
Message-Id: <045007a5c718384c036c5a843e2c888a@isr.umd.edu>
Cc: howardk@fatdog.com, RDF Data Access Working Group <public-rdf-dawg@w3.org>
To: andy.seaborne@hp.com

On Apr 19, 2005, at 12:26 PM, Seaborne, Andy wrote:

> Howard Katz wrote:
>>  > Howard,
>>  >
>>  > Thanks for this - it is really helpful, especially about the type
>>  > promotion and subtype substitution.  I think I can upgrade to that 
>> style
>>  > of execution so I think it is doable.  I'd be interested in ptrs 
>> to how
>>  > expression evaluation maps to existing technologies like SQL.
>> Sorry, I don't have any data points in that department.
>>  >
>>  > Do you think this means we need to say what happens to literals of 
>> type
>>  > XMLLiteral?
>> Yikes, I'd forgotten all about xml literals! Do you really want to go 
>> there?
> It's only because all the major issues are clear from your email that 
> I thought of such corner cases.  Personally, I have seen little use of 
> XML literals so I don't have a strong sense of what to do or how 
> important they are.

Though under attack, OWL-S (under my influence) makes extensive use of 
XMLLiterals. It would be better to be able to use XML Schema complex 
types, but I don't see how to usefully combine XMLLiterals and further 
typing of them (except by adding xsi:types to the literals).

Received on Tuesday, 19 April 2005 16:35:38 UTC

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