(texinfo.gz) set value

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(texinfo.gz) set clear value

(texinfo.gz) ifset ifclear

 
 `@set' and `@value'
 -------------------
 
   You use the `@set' command to specify a value for a flag, which is
 later expanded by the `@value' command.
 
   A "flag" is an identifier.  In general, it is best to use only
 letters and numerals in a flag name, not `-' or `_'--they will work in
 some contexts, but not all, due to limitations in TeX.
 
   The value is the remainder of the input line, and can contain
 anything.
 
   Write the `@set' command like this:
 
      @set foo This is a string.
 
 This sets the value of the flag `foo' to "This is a string.".
 
   The Texinfo formatters then replace an `@value{FLAG}' command with
 the string to which FLAG is set.  Thus, when `foo' is set as shown
 above, the Texinfo formatters convert this:
 
      @value{foo}
 to this:
      This is a string.
 
   You can write an `@value' command within a paragraph; but you must
 write an `@set' command on a line of its own.
 
   If you write the `@set' command like this:
 
      @set foo
 
 without specifying a string, the value of `foo' is the empty string.
 
   If you clear a previously set flag with `@clear FLAG', a subsequent
 `@value{flag}' command will report an error.
 
   For example, if you set `foo' as follows:
 
      @set how-much very, very, very
 
 then the formatters transform
 
      It is a @value{how-much} wet day.
 into
      It is a very, very, very wet day.
 
   If you write
 
      @clear how-much
 
 then the formatters transform
 
      It is a @value{how-much} wet day.
 into
      It is a {No value for "how-much"} wet day.
 

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(texinfo.gz) set clear value

(texinfo.gz) ifset ifclear