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Including LaTeX source of mathematical expressions, within the PDF documentof a text-book or research paper, has definite benefits regarding`Accessibility' considerations. Here we describe three ways in which this canbe done, fully compatibly with international standards ISO 32000, ISO 19005-3,and the forthcoming ISO 32000-2 (PDF 2.0). Two methods use embedded files, alsoknown as `attachments', holding information in either LaTeX or MathML formats,but use different PDF structures to relate these attachments to regions of thedocument window. One uses structure, so is applicable to a fully `Tagged PDF'context, while the other uses /AF tagging of the relevant content. The thirdmethod requires no tagging at all, instead including the source coding as the/ActualText replacement of a so-called `fake space'. Information provided thisway is extracted via simple Select/Copy/Paste actions, and is available toexisting screen-reading software and assistive technologies.

PDF/A-3u as an archival format for Accessible mathematics