Re: ANN: XML and Databases article
Subject: RE: ANN: XML and Databases article > Ronald Bourret wrote > Steven R. Newcomb wrote: > What do you mean by "different databases" here? If you mean relational > databases v. hierarchical databases v. object-oriented databases, then > there's no problem -- I would expect each to have a different property set. > On the other hand, if you mean DB2 v. Oracle v. Informix v. SQL Server, > then it seems there is something broken -- I would very much expect all > relational databases to have the same property set. There are a few points that haven't been made in this discussion. It's a mistake to classify DB2, Oracle, Informix, and SQL Server as relational DBMSs having the same logical data model. DB2, Oracle, Informix, and Microsoft SQL Server are all SQL DBMSs, but the first three are object-relational products. They have extensible architectures so you can add user-defined types and user-defined methods to customize a database. You can add custom access methods and indexes by writing server extensions. You can install Java classes in a database to add types and methods (http://www.devx.com/upload/free/features/javapro/1999/03mar99/kn0399/kn0399 .asp) There is a distinction between an active database and a passive data store. You can embed logic in active databases, so they can act as event alerters and rule enforcers (e.g., reject data that isn't within a certain range of values). Finally, the days when SQL DBMSs stored only columns of number and characters are gone. Some still do, but that is not a defining characteristic. Most of the major SQL vendors moved to a universal server model that supports rich types as well as traditional tabular data. For storing an XML document, you have the option of decomposing it or storing it as a whole. query tool), not in others (wanting to expose tabular database 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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