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Published in:
2014 | OriginalPaper | Chapter
PDF/A-3u as an Archival Format for Accessible Mathematics
Author : Ross Moore
Published in: Intelligent Computer Mathematics
Publisher: Springer International Publishing
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Including
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
or
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
tagging of the relevant content. The third method requires no tagging at all, instead including the source coding as the
relacement of a so-called ‘fake space’. Information provided this way is extracted via simple
/
/
actions, and is available to existing screen-reading software and assistive technologies.