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Re: [xml-dev] Processing instruction to designate a schema as subset of another?

Do you mean something like standalone="yes/no" ?


On Wed, Aug 26, 2009 at 8:48 PM, Stephen Green<stephengreenubl@gmail.com> wrote:
> Would it be feasible to use a processing instruction at the
> top of an xml schema to designate it as a subset of another
> schema (in the sense Rick Jelliffe recently mentioned on this
> list of all instances valid by the subset schema being also
> valid by the superset schema)? How would one go about
> defining such a processing instruction? Would it have to be
> something like DSDL - via ISO? I noticed Rick's mention of
> the need for specifying a schema and/or namespace as a
> subset of another schema and/or namespace and thought
> maybe the problem could get critical mass of interest sufficient
> to solving it. I have found the problem exists not only when
> the subset schema has a different namespace; it was tricky
> to find a way to define a subset without changing the
> namespace when first working on subsets for the Universal
> Business Language and I think people eventually just wrote
> a second schema with the same namespace but without any
> way other than an accompanying prose spec to show it as
> defining a subset of a superset (the Standard UBL schemas).
> Maybe to solve this a processing instruction could be defined
> which specifies within a subset schema that it is a subset of
> schema at location ABC, either same namespace or
> namespace XYZ. There might also need to be a way to tell
> tools (if feasible, I've no idea) that they should either allow
> nodes of just the superset or not when the subset schema is
> given as the schema for the instance. How then to get such
> a PI or set of PIs specified and supported?
> Otherwise it might be that one has to stick with prose and/or
> accompanying (test) assertions such as those of Schematron
> or (work-in-progress) OASIS TAG TC's Test Assertion Markup
> Language (shameless plug).
> ---
> Stephen D Green
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