Is an XML schema an alternative to DTD

Schemas are becoming more popular and DTDs less so. A schema is an XML-based syntax for describing how the XML document is marked up or how it looks – very similar to a DTD, but a DTD has a lot of drawbacks.
A DTD doesn’t use anything like XML syntax to describe the definition. You can’t do data typing in a DTD, and it’s not extensible.

An XML schema allows you to specify elements as an integer, a float, a Boolean, or whatever, and has more extensibility to it. Plus, it’s in XML format. Your XML schema, the definition for your XML, is also in XML format.
Microsoft is pushing the XML schema – so you’re likely to see schemas more and more. That’s all we use. In fact, the new BizTalk Server from Microsoft actually uses schemas.

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