@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.
In addition, you can use the @set flag command to set the
value of flag to a string of characters; and use
@value{flag} to insert that string. You can use
@set, for example, to set a date and use @value to
insert the date in several places in the Texinfo file.
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