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Kay Michael wrote: > > > AFAIK, the terms "schema" and "sub-schema" originated from > > the work of the CODASYL Data Base Task Group (DBTG) in the late '60s and > > early '70s. > > For the record, I think DBTG took the concepts (I'm not sure about the > terminology) from Honeywell's IDS database system developed in the mid > 1960s. Charlie Bachmann was a key player in both. > > Mike Kay > My understanding is that what DBTG took from IDS was its data structuring concepts, records and the "set" (owner/member record relationship). I believe the concepts of schema and subschema were extensions introduced during the course of DBTG's work (my recollection is that Tax Metaxides, the DBTG Chairman, had a lot to do with introducing these concepts). -- Frank Manola The MITRE Corporation 202 Burlington Road, MS A345 Bedford, MA 01730-1420 mailto:fmanola@m... voice: 781-271-8147 FAX: 781-271-8752 *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/ ***************************************************************************
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