Re: Arbitrary grouping
Using a Schematron approach might be appropriate in this case. Depending upon how arbitrary the grouping is, it may be a more practical means as opposed to permuting all the possible groupings. Basically, XSLT templates are used to apply integrity constraints written as XPath expressions. The loosely coupled tests which result can flexibly apply across multiple structures in ways which are not practical to implement using a syntax such as W3 Schema. It isn't an either-or scenario: schemas can be combined with schematron too. A better explanation is at http://www.topologi.com/public/Schtrn_XSD/Paper.html See also http://www.topologi.com/products/validator/index.html - Mitch Hunsberger, Peter wrote: > I'm new to XML schema and am confused on how I would create a schema that > introduces a set of arbitrary grouping for a set of elements. For example: > > <x> > <a/> > <b/> > <c/> > <d/> > <e/> > <f/> > </x> > > or > > <x> > <group> > <a/> > <b/> > </group> > <c/> > <group> > <d/> > <e/> > <f/> > </group> > </x> > > or perhaps > > <x> > <a/> > <group> > <b/> > <c/> > <d/> > </group> > <e/> > <f/> > </x> > > would all be considered valid. Additional constraints are that any number > of groups can occur, but the elements a through f can each only occur a > maximum of once inside the x element whether they are children of a group or > not. > > Peter Hunsberger > > > ----------------------------------------------------------------- > 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> > >
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