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4. Creating PDF and Other Editions > 34. Multipurpose PDF

Multipurpose PDF

Give readers many editions in one package without tagging your PDF.

PDF makes a document portable by wrapping all its resources into a neat, single package. As people desire more features, more things get packed into the PDF. By attempting to make one file do all things for all people, that one file becomes large and unwieldy. Its portability begins to suffer.

In particular, Adobe has worked to add an information-oriented XML-ish layer on top of its presentation-oriented PDF features. The result is a single file that you can use for many purposes, such as paper printing, handheld reading, accurate text-to-speech, and accurate data extraction. However, creating these tagged PDFs is a slow and expensive process. The data layer is interwoven with the presentation layer, so accessing the data is difficult. Consequently, your readers have few options for utilizing this data. Finally, a tagged PDF file can grow to more than twice the size of its untagged counterpart.


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