@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.