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RELAX NG is a grammar language created in 2001.

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In computing, RELAX NG (REgular LAnguage for XML Next Generation) is a schema language for XML - a RELAX NG schema specifies a pattern for the structure and content of an XML document. A RELAX NG schema is itself an XML document but RELAX NG also offers a popular compact, non-XML syntax. Compared to other XML schema languages RELAX NG is considered relatively simple. Read more on Wikipedia...

Example from the web:
# A RELAX NG compact syntax pattern # for an address book. element addressBook { # an entry in the address book element card { element name { text }, element email { text } # an email address }* }

Language features

Feature Supported Example Token
Line Comments
# A comment
# Comments start with a # and continue to the end of the line:
Semantic Indentation X

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