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Tony Coates wrote: > > Unfortunately, the application requirement I was alluding to is > Restriction(Snew,Sapp), which is equivalent to Extension(Sapp,Snew) > (from what I understand of your algebra at " > http://www.rddl.org/SchemaAlgebra.html"). So, the problem remains, but > hopefully more clearly expressed now. ok. so when Extension(Snew,Sold) it is 'safe' to substitute the new schema Snew as the primary scheme (e.g. purpose= http://www.rddl.org/purposes#schema-validation) in the namespace. on the other hand when Restriction(Snew,Sold) doing this will 'invalidate' previously happy documents. Two options are: 1) use a new namespace 2) use something like xsi:schemaLocation to reference the proper schema for this particular instance document of course (2) is specific to XML Schema, and supposing the same facility is needed for other schemata e.g. Schematron, TREX we might invent a similar instance attribute: rddl:schemaPurpose="..." which generally defaults to http://www.rddl.org/purposes#schema-validation but could allow selection of a set of schemata all sharing the same purpose (and this purpose URI is then used to perform versioning). btw: thanks for your useful comments and corrections on the schema algebra > > Cheers, > Tony. - Jonathan
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