Add PDF notation?

[Norman Walsh <nwalsh@arbortext.com>]

Does anyone object if we add a PDF notation? We haven't actually
published 4.0 yet, and it seems a dead easy request to satisfy
(and is apparently required for the pdftex backend).

                                        Cheers,
                                          norm

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Norman Walsh <nwalsh@arbortext.com> | When the situation is desperate,
Principal Software Engineer         | it is too late to be serious. Be
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