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Effective XML: 50 Specific Ways to Improve Your XML by Elliotte Rusty Harold

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Item 28. Use Only What You Need

The complete family of XML specifications has grown so large that it's approaching, and in some cases exceeding, the complexity of the SGML specification it effectively replaced. While XML 1.0 is fairly straightforward and well supported, the complete family of XML + DTDs + Namespaces + XPath + Schemas + XLinks + XPointers + XInclude + Infoset + PSVI + XML 1.1 + Namespaces 1.1 + Kitchen Sink is beginning to show signs of the same interoperability issues that plagued SGML. Most tools support some subset of these technologies. Others support a different, intersecting subset. Few if any tools support all of it.

Don't buy into the hype and rumor. Do not feel obligated to include every last member of the XML family ...

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