Re: Creating flexible & extensible schemas (for a university E
Hi Michael, Thanks very much for the advice. I was not entirely sure what you meant by a meta-schema, so I looked Googled it and found this article: http://www.xml.com/pub/a/2002/10/02/metaschema.html. I don't think you meant that I should modify XMLSchema.xsd, but instead that I should have an Events.xsd schema that is somehow modified to become UCBerkeleyEvents.xsd. That is exactly what I did in the schemas I pointed to in the first message, and I tried using redefines on one hand and substitution groups on the other to accomplish this. Since you mention having schemas in the same namespace, I'm guessing you're referring to a process that involves redefines? But you also mention transformation & input parameters, so I'm not sure...can you clarify? Thanks, Allison ----- Original Message ----- From: "Michael Kay" <michael.h.kay@n...> To: "'Allison Bloodworth'" <abloodworth@b...>; <xml-dev@l...> Sent: Monday, November 01, 2004 12:22 PM Subject: RE: Creating flexible & extensible schemas (for a university Event) > > One question I'm struggling with is whether to make most of > > the elements optional. > > There doesn't have to be one schema. > > It can be a bit tricky to manage multiple schemas for the same namespace > (because there are parts of the spec that seem to assume that by specifying > the namespace, you have identified the schema), but it's definitely part of > the design thinking that the validation rules you want to impose might be > stricter in some circumstances, weaker in others. > > The right solution here might be a meta-schema that can be transformed > (using a set of input parameters) into the target schema you actually use > for validation. For example, this allows the list of enumeration values to > be varied. > > Michael Kay > http://www.saxonica.com/ > > > ----------------------------------------------------------------- > 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> > >
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