RELAX NG
RELAX NG (pronounced “relaxing”) is the real sleeper of schema languages, but it has the potential to become the most popular schema language of all. Where the W3C XML Schema Language can feel a bit intimidating at times, RELAX NG is far simpler and cleaner, perhaps because RELAX NG is primarily the product of two smart developers (James Clark and Murata Makoto) rather than a design by committee. RELAX NG can do everything DTDs can do except define entities and notations, and it can do everything the W3C Schema Language can do except define new data types. However, RELAX NG does enable you to reference different data type libraries, including the W3C's own set of XML Schema primitive types.
Key features of RELAX NG include the following: ...
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