Schema Alternatives
Just as DTDs are not the only way to create a schema for use with XML, there are also alternatives to XML Schemas. The two most popular alternatives to XML Schemas include RELAX NG and Schematron.
RELAX NG
The most promising schema alternative currently being developed is the RELAX NG standard, which is being sponsored by the Organization for the Advancement of Structured Information Standards (OASIS). The RELAX NG standard is the result of a positive reception among developers to both TREX and RELAX, two older schema alternatives, and the desire to see features of each incorporated into the other, culminating in RELAX NG, a merger of TREX and RELAX.
OASIS has released a formal standard for RELAX NG, which can be found at ...
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