Re: Opinions requested
At 02:17 PM 3/5/1999 +1100, Marcelo Cantos wrote: >>"Jeffrey E. Sussna" wrote: >> >> There is not (AFAIK) yet any such thing as an XDBMS (though you could consider >>a file system of XML documements plus a web server to resolve URL's to those >>documents as such a thing). > >I am continually surprised to hear remarks such as this. SIM _is_ an XDBMS >(it is also an SGML, MARC, RTF, etc. database with structure and full content >query capabilities). I think one of the reasons you hear these kinds of remarks is that the terminology surrounding these systems is used differently by different folks. For instance, from what I know of SIM, I wouldn't call it a DBMS system of any kind, as I don't believe (I could be wrong) it supports referential integrity constraints, concurrency control, recoverable transactions, and other features I would expect out of a reasonable DBMS. Granted it has hooks that allow you to get it to work with a DBMS that can provide all that, but that doesn't make SIM itself a DBMS. I would instead class SIM as an information retrieval system, and a pretty damned good one at that. However, SIM performs as well as it does in great part because it's not doing the extra work that a DBMS should do, and which add greatly to retrieval time from database systems (as well as limiting their ability to handle complex data formats gracefully). This isn't to knock SIM; anyone who needs a flexible information retrieval system should be taking a very serious look at it. The Z39.50 support alone puts it way ahead of the market as far as I'm concerned. But I don't think SIM is evidence that there are DBMS systems that handle SGML/XML well; I don't think they do. Oracle may very well be getting there with its latest release, but I suspect there's still a lot of work to be done there. Jerome McDonough -- jmcdonou@l... | (......) Library Systems Office, 386 Doe, U.C. Berkeley | \ * * / Berkeley, CA 94720-6000 (510) 642-5168 | \ <> / "Well, it looks easy enough...." | \ -- / SGNORMPF!!! -- From the Famous Last Words file | |||| xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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