Catalogue of the schemas/types/grammars expected by attributes.
The following list gives the legal strings corresponding to values of
the given types.
The syntax for describing legal type strings is a mixture of literal strings,
stdio encodings (e.g.,
%f for a double), and regular expressions.
For regular expressions,
(...)* indicates 0 or more copies of the expression
enclosed in the parentheses,
(...)+ indicates 1 or more, and
(...)? denotes 0 or 1 copy.
String with Escape Sequences