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@set, @clear, and @value

You can direct the Texinfo formatting commands to format or ignore parts of a Texinfo file with the @set, @clear, @ifset, and @ifclear commands.

Brief descriptions:

@set flag [value]
Set the variable flag, to the optional value if specifed.
@clear flag
Undefine the variable flag, whether or not it was previously defined.
@ifset flag
If flag is set, text through the next @end ifset command is formatted. If flag is clear, text through the following @end ifset command is ignored.
@ifclear flag
If flag is set, text through the next @end ifclear command is ignored. If flag is clear, text through the following @end ifclear command is formatted.