RELAX NG - Grammar language

RELAX NG is a grammar language created in 2001.

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23Years Old

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...

Tags: grammarLanguage
Early development of RELAX NG happened in https://relaxng.org
relaxng.org was registered in 2001

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	✓	# Comments start with a # and continue to the end of the line:
Semantic Indentation	X