RELAX NG | Article about RELAX NG by The Free Dictionary
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RELAX NG(REgular LAnguage Description for XML Next Generation) An XML schema from OASIS that is based on RELAX and TREX. It is easier to learn than the W3C's XSD XML schema and adds missing features. For example, RELAX NG allows more complex relationships between attributes and elements to be expressed. RELAX was developed by Murata Makoto and the Japanese Standards Association, and TREX (Tree Regular Expressions) was created by James Clark. RELAX NG schemas are named with the file extensions .RNG or .RNC. See XML schema.
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Unfortunately, that's what was starting to happen before RELAX NG