> To take a simple example, the word 'schema' -- I have an understanding of > what this means in the context of XML, but it clearly also has a more formal > meaning, as it can be applied to database design as well. So what's the > definition of 'schema'? A schema is essentially a data type, every database / document is an instance of its schema, and the schema describes the set of all permitted databases / documents. > My question is, are there any books or online documents dealing with the > theory of 'information stuctures'? Some kind of description of the ways in > which information may be structured, and the advantages of doing it a > particular way? [MHK>] Yes! Though most of the ones I know of are written in the "database" context rather than the "document" context. Some are very academic / mathematical / philophical, some more oriented to the practitioner [MHK>] One of the best in my view, but very hard to get now, is Bill Kent's "Data and Reality" Mike Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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