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At 01:17 PM 3/4/2005, Michael Kay wrote: >If the stylesheet is simply checking against a grammar, then you would >certainly be better off using a grammar-based validator. There are >essentially three candidates: DTDs, XML Schema, and RelaxNG. Which you >choose depends on all sorts of factors, personal, political and technical. > >It might well be the case, of course, that your stylesheet is doing checks >that can't be described simply in a grammar. It is doing checks that can't be easily described in the schema, which is what worries me... thanks andrew >Michael Kay >http://www.saxonica.com/ > > > -----Original Message----- > > From: Andrew Jeavons [mailto:apj@a...] > > Sent: 04 March 2005 17:50 > > To: xml-dev@l... > > Subject: Schema, BNF and parsing > > > > First apologies if this is OT for this list or contains egregious > > assumptions and statements....I am not by any means a XML expert. > > > > I have recently started working with a product which uses XML as the > > definition framework. We have a XML (QML we call it) which > > describes how to ask questions. So QML has elements like "text", "sub > > question" and so on. We develop scripts which are validated > > for syntactic > > validity and then passed to an execution engine. Of course > > the QML written > > has to conform to the schema defined. As far as I can currently work > > out we use a 2666 line XLST script to check QML. QML is not a complex > > "language", it reminds me of IBM MVS JCL - 5 verbs and 200 > > qualifiers for > > the verbs. > > 2666 lines of anything to check this "language" seems extreme. I have > > written parsers using YACC in the past and it seems to me for > > numerous > > reasons using > > some sort of BNF/EBNF defined grammer and Bison/YACC type > > tools will be > > VASTLY more efficient and flexible. What I would like to ask > > is are there any > > tools anywhere to convert a schema to BNF/EBNF ? > > > > thanks > > andrew > > > > Andrew Jeavons > > > > > > > > ----------------------------------------------------------------- > > 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://www.oasis-open.org/mlmanage/index.php> > > > > Andrew Jeavons www.andrewjeavons.com +1 513 871 8278
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