Direc­tory tex-archive/macros/latex/contrib/optional

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op­tional – Fa­cil­i­tate op­tional print­ing of parts of a doc­u­ment

Op­tional pro­vides sim­ple, flex­i­ble, op­tional com­pi­la­tion of LaTeX doc­u­ments. Op­tion switches may be given via pack­age op­tions, by the \UseOp­tion com­mand, or in­ter­ac­tively via the \AskOp­tion com­mand (help text may be pro­vided, by defin­ing the \Ex­plainOp­tions com­mand).
The pack­age is not ro­bust, in the way that com­ment pack­age is, against ill-be­haved text. In par­tic­u­lar, ver­ba­tim text may not be di­rectly in­cluded in op­tional sec­tions (whether they're in­cluded or not).