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RE: XQuery and DTD/Schema?

• To: Michael Kay <michael.h.kay@n...>
• Subject: RE: XQuery and DTD/Schema?
• From: Betty Harvey <harvey@e...>
• Date: Wed, 3 Jul 2002 11:43:47 -0400 (EDT)
• Cc: <xml-dev@l...>
• In-reply-to: <005c01c222a5$9b059de0$6401a8c0@pcukmka>

Thanks Michael and all who answered my question!  I didn't realize
I would hit so many 'nerve endings'.  Politics aside - organizations
are making business decisions based upon incomplete and/or inaccurate
information.

Thanks again!

Betty

/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
Betty Harvey                         | Phone: 410-787-9200 FAX: 9830
Electronic Commerce Connection, Inc. |
harvey@e...                    | Washington,DC SGML/XML Users Grp
URL:  http://www.eccnet.com          | http://www.eccnet.com/xmlug/
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\/\/

On Wed, 3 Jul 2002, Michael Kay wrote:

> The input to an XQuery query consists of (at compile time) a set of type
> definitions and (at run time) a set of documents/trees with type
> annotations. The set of type definitions can be empty, and the type
> annotations can be defaulted, so queries can therefore be written
> against documents that have not been subjected to schema processing.
>
> The XQuery working group has only recently started work on conformance
> statements. There is a draft proposal on the table that defines a
> conformance level for implementations that don't support schema
> processing - in other words, such implementations don't handle type
> definitions or type annotations. Whether this proposal makes it into the
> next draft depends more (I think) on getting the detail right than on
> any differences about the principle.
>
> Of course it's also possible that some vendors will want to impose
> stronger constraints, for example that all the documents in the scope of
> a single query conform to the same schema. Presumably people who don't
> like such a constraint won't buy the product...
>
> As far as the XQuery spec is concerned, although the type system is
> chosen to be compatible with XML Schema, there is no requirement for the
> type definitions and type annotations actually to be produced by XML
> Schema processing (just as XSLT can process a source tree that wasn't
> created by parsing source XML).
>
> I hope this goes some way to answering the question.
>
> Michael Kay
> Software AG
> home: Michael.H.Kay@n...
> work: Michael.Kay@s...
>
> > -----Original Message-----
> > From: Betty Harvey [mailto:harvey@e...]
> > Sent: 02 July 2002 23:51
> > To: xml-dev@l...
> > Subject:  XQuery and DTD/Schema?
> >
> >
> >
> > I haven't been following the progress of XQuery closely.  I
> > was advised today that a W3C Schema had to be developed
> > instead of a DTD because XQuery only works with Schema.  I
> > was skeptical that the XQuery specification would really say
> > this.  However, I found what I believe to be conflicting
> > information in the XQuery specification:
> >
> >   "XQuery's type system is based on [XML Schema]. Work is in
> > progress to
> >    ensure that the type systems of XQuery, the XQuery Core,
> > and XML Schema
> >    are completely aligned."
> >
> > I interpret the above statement to mean that XQuery datatypes
> > will be based upon XML Schema.  I believe this statement may
> > be the reason for others thinking that an XML Schema and not
> > DTD's or RELAX NG was required in order to use XQuery.
> >
> > Any thoughts on my interpretation of the specification.  Thanks!
> >
> > Betty
> >
> > /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
> > Betty Harvey                         | Phone: 410-787-9200 FAX: 9830
> > Electronic Commerce Connection, Inc. |
> > harvey@e...                    | Washington,DC SGML/XML
> > Users Grp
> > URL:  http://www.eccnet.com          | http://www.eccnet.com/xmlug/
> > /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\/\/
> >
> >
> >
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-- 

• References:
  • RE: XQuery and DTD/Schema?
    • From: "Michael Kay" <michael.h.kay@n...>

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