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What is a Tagged PDF?

Can someone explain what a "Tagged PDF" is and how it differs from a regular non-tagged PDF?

Marked PDFs contain special content such as XML, Rich Media, Javascript, etc.

What TeX-toolchains generate Tagged PDF files?

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Tagged PDF is a PDF file containing meta information around specific groups of PDF instructions within the contents of a page. This meta-information has many uses: text extraction, content overflow, document availability, geographic information in PDF format, containing maps, etc.

If you need to know more information about this topic, I would recommend reading Chapter 10 - Document Interchange Adobe PDF Reference version 1.7 .

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The main reason it is used is accessibility. With the right tags, the screen reader (for the blind) can figure out where the headers go, what the table / footnote / graphic is and so on. There is also a feature called PDF Thread Threading, which is useful for magazine or newspaper layouts where the article is divided into boxes / pages.

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