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Abstract
Including LATEX source of mathematical expressions, within the PDF document
of a text-book or research paper, has definite benefits regarding `Accessibility' considerations.
Here we describe three ways in which this can be 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, also known as `attachments',
holding information in either LATEX or MathML formats,
but use different PDF structures to relate these attachments to regions of the
document window.
One uses structure, so is applicable to a fully `Tagged PDF' context,
while the other uses /AF tagging of the relevant content.
The third method requires no tagging at all, instead including the source
coding as the /ActualText replacement of a so-called `fake space'.
Information provided this way is extracted via simple Select/Copy/Paste actions,
and is available to existing screen-reading software and assistive technologies.