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Isn't XML Information Set what you want here (see http://www.w3.org/TR/xml-infoset/). Taxonomy is defined as the "science and practise of classification" (in my convenient dictionary application), and as far as I understand, that's what the XML Infoset is for.
Rick Marshall wrote...
> hi all
> following several discussions we've had lately, mostly on relational
> models and document management i'm going to float the idea - which may
> be covered elsewhere, please redirect me if appropriate -
> that having a
> taxonomy of xml may help us to understand what forms, and
> when are good
> for different problems.
> if we take numbers as an analogy (and that's all it is, there
> are plenty
> of others) they can be divided into sets - integer, real, rational,
> irrational, complex, etc and we increase our understanding and use of
> numbers by developing theorems that cover the different sets.
> it seems to me that xml is as diverse as numbers or any
> similar grouping
> and that by focusing on well defined sets of xml structures and their
> properties we can get the theorems to improve our use and
> eg one set might be xml with tags only - no attributes;
> another might be
> xml that is constrained to two levels; etc
> by understanding the properties and operators that are valid on these
> sets we can then see the analogies to other technologies such as
> relational models, markup, etc.
> just a thought at the moment