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An excellent message from Henry Thompson (see below). -----Original Message----- From: Henry S. Thompson [mailto:ht@inf.ed.ac.uk] Sent: Friday, November 04, 2011 3:55 PM To: Eliot Kimber Cc: Costello, Roger L.; xmlschema-dev@w3.org Subject: Re: A valuable lesson on the difference between XML Schemas and ontologies Eliot Kimber writes: > XML schemas are nothing more than document syntax constraint specifications. > There is no sense in which then can be anything more than a very weak > reflection of some deeper ontology that governs the semantic objects for > which the XML governed by the XSD schema is one possible serialization. > > That is, ontologies describe relationships among things, schemas define > syntactic constraints on XML elements. The fact that the XSD mechanism has a > weak facility for defining type hierarchies does not make it a language for > describing taxonomies or ontologies. Hear hear! Confusing application domain analysis/data model design with interchange/archival document language design is a fundamental (albeit very common) mistake. Don't do that. ht -- Henry S. Thompson, School of Informatics, University of Edinburgh 10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 651-1426, e-mail: ht@inf.ed.ac.uk URL: http://www.ltg.ed.ac.uk/~ht/ [mail from me _always_ has a .sig like this -- mail without it is forged spam] [Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] |
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