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A simple string that does not contain white space may be left
unquoted. The string must not contain any of the characters special to
the definition text (i.e., "
, #
, '
, (
,
)
, ,
, ;
, <
, =
, >
, [
,
]
, `
, {
, or }
). This list is subject to
change, but it will never contain underscore (_
), period
(.
), slash (/
), colon (:
), hyphen (-
) or
backslash (\\
). Basically, if the string looks like it is a
normal DOS or UNIX file or variable name, and it is not one of two
keywords (‘autogen’ or ‘definitions’) then it is OK to not
quote it, otherwise you should.