
Originally, SGML was the flavour of the month. SGML documents were structured using DTDs. With the advent of XML, the DTD had some good features and some bad features. Before we discuss the various types of schemas. While Schemas will definitely figure in your future projects, a consensus view is that the final proposal of the working group on Schemas will not look like the current implementation of Schemas within Microsoft IE5. For example, in August 1998 the Schema syntax changed substantially. It is expected that will happen again once the working draft becomes a recommendation.
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