[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
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! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|