GDL Keywords

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A GDL keyword is a token that consists of characters from the set [A-Z, a-z, 0-9, *, _, ?]. By convention, most keywords begin with an asterisk (*). There is no limit to the length of a keyword.

A GDL keyword is required for any GDL entry. The keyword is followed by an optional value. If a value is supplied, the keyword and value must be separated by a colon (:). Optional whitespace characters can also appear between the keyword and value.