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   Re: [xml-dev] W3C's five new XQuery/Xpath2 working drafts - Still m

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----- Original Message -----
From: "Jonathan Robie" <jonathan.robie@softwareag.com>
To: "Dare Obasanjo" <kpako@yahoo.com>; "Champion, Mike"
<Mike.Champion@SoftwareAG-USA.com>; <xml-dev@lists.xml.org>
Sent: Saturday, December 29, 2001 8:03 PM
Subject: Re: [xml-dev] W3C's five new XQuery/Xpath2 working drafts - Still
missing Updates

> SQL very definitely has a data dictionary, which plays the same role as a
> schema in XML. In relational terms, I think you are proposing that we need
> updates, but there is no need to have a data dictionary in order to support
> them.

I always considered the data dictionary the equivalent of querying the
underlying repository for validation information and not part of the SQL
language per se but since I've not actually read the SQL standard  this is
probably an unreasonable assumption to make.

For now, I'll drop comparisons of SQL and XQuery since I cannot make informed
statements about the contents of the SQL standard.

> Ah, but if two different implementations look at the same query, you would
> like them to agree whether that query is valid. That is not going to happen
> unless you specify how they should determine validity of queries. I agree
> that the repositories should do the validation, but I think the language
> specification should clearly specify which queries are valid.

This is a valid concern but not one that I think requires that the only DML
language that the W3C is currently working on (Yes, I know XQuery isn't really
a DML at this point)  will be inexorably linked to W3C schemas.

If this is the case then maybe there should be an OASIS TC working on a DML
similar to XQuery or XPath 2.0 without the heavy reliance on W3C XML schemas.

Once my power is secure, I will destroy all those pesky time-travel devices.

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