OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.


Help: OASIS Mailing Lists Help | MarkMail Help



   Re: Opinions requested

[ Lists Home | Date Index | Thread Index ]
  • From: Jerome McDonough <jmcdonou@library.berkeley.edu>
  • To: xml-dev@ic.ac.uk
  • Date: Fri, 05 Mar 1999 09:37:29 -0800

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
>>a file system of XML documements plus a web server to resolve URL's to
>>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
>query capabilities).

I think one of the reasons you hear these kinds of remarks is that the
surrounding these systems is used differently by different folks.  For
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@library.Berkeley.EDU  |  (......)
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@ic.ac.uk
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@ic.ac.uk the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo@ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 2001 XML.org. This site is hosted by OASIS