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XML Companion, The, Third Edition by Neil Bradley

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Alternative modelling languages

A number of alternatives to the DTD have arisen since the release of the XML standard. They differ in capability and scope, but on two things they all agree: name and syntax.

'Schema' languages

The term schema is used to describe all of the alternative modelling languages. In the IT field, this name has its roots in database technologies. It is used to describe the tables and fields in a database, including constraints on the values of particular fields, and the relationships between tables (to those familiar with these concepts, the similarity to document modelling should be obvious). More generally, the term simply means a representation of something using a diagram, a plan or an outline.

Note that the plural ...

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