[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: xPath 2.0, XSLT 2.0 ... size increase over v1.0


Re:  xPath 2.0
From: "Murali Mani" <mani@C...>
> On Thu, 12 Jun 2003, Michael Kay wrote:
>
> > > Thanks for the clarification, these are the things I was
> > > hoping someone could tell me, using for iterator etc, have we
> > > introduced more non-closed operators?? Has someone looked at
> > > them closely..?? I suspect there will be some more operators
> > > of this nature in XPath 2.0..
> >
> > The input and output of XPath operations are constrained to be values
> > described by the XPath data model. In that sense the language is closed.
> > Whether the data model has the particular mathematical properties you
> > are looking for is something I can't easily judge.
>
> That is right, with respect to values they are closed. But the question is
> with respect to schema.. I think this might be useful to know these
> mathematical properties..??
>
> Anyways, if someone does study all the operations of XPath, XQuery etc,
> and see under what they are closed (w.r.to schema), I think it might be
> useful..

Seems to me closure questions should be grounded in regular hedge (not
regular tree) grammars, as the output sequences of XPath/XQuery are, in
fact, hedges. I believe MURATA Makato has explored this territory (trees +
queries = hedges).

Bob

>
> cheers and regards - murali.
>
> > There are a few glitches in terms of closure, for example I'm not very
> > comfortable with the fact that the semantics of FLWR expressions in
> > XQuery are defined using a notion of "tuples" which are objects that
> > can't be represented directly in the data model, but overall I think
> > it's pretty clean.
> >
> > Michael Kay
>
>
> -----------------------------------------------------------------
> The xml-dev list is sponsored by XML.org <http://www.xml.org>, an
> initiative of OASIS <http://www.oasis-open.org>
>
> The list archives are at http://lists.xml.org/archives/xml-dev/
>
> To subscribe or unsubscribe from this list use the subscription
> manager: <http://lists.xml.org/ob/adm.pl>
>
>


PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
 

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.


Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.