December 1999
Intermediate to advanced
992 pages
22h 3m
English
Content preview from XML Unleashed
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Modeling Data with DTDs
DTDs are a means of establishing a schema for XML documents. DTDs originated in SGML and serve as the standard schema mechanism for validating SGML documents. Since XML is a subset of SGML, it only makes sense to use the same schema approach. A big benefit of using DTDs as schemas is that existing SGML tools can be easily modified to support XML because they already support DTDs in SGML. DTDs are not perfect, however. In fact, their limitations are serious enough to warrant considering another approach to modeling XML data.
DTDs rely on a specialized syntax for describing the structure of XML vocabularies. This is one of the XML community's big complaints about DTDs. Why should it be necessary to learn a specialized syntax ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.