2.3 Identifiers and keywords
Identifiers (also referred to as names) are described by the following lexical definitions:
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identifier ::= (letter|"_") (letter | digit | "_")* letter ::= lowercase | uppercase lowercase ::= "a"..."z" uppercase ::= "A"..."Z" digit ::= "0"..."9"
Identifiers are unlimited in length. Case is significant.
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Release 2.4.4c1, documentation updated on 11 October 2006.