In most cases, when considering PDF accessibility, target disabled people are usually assumed as the blind, and the conversion of PDF into Braille or text files with Furthermore, it should be emphasized that there are no well-established standards for an accessible STEM document including mathematical expressions in PDF. Unfortunately, most of PDF documents in the world are not accessible, and it is difficult to convert a given (inaccessible) PDF into PDF/UA automatically with a concise procedure. , it is not necessarily easy to produce a document so as to conforms to the standard of PDF/UA. Although the PDF/UA standard is suggested as so-called “accessible PDF” “Adobe Portable Document Format (PDF)” is commonly used for the exchange of STEM (science, technology, engineering and math) contents among researchers or in various educational fields.
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