I know that one can embed RDFa in XHTML documents. Is there any standard accepted way to do this for PDF? (By “standard”, I mean in a way that major search engines recognize.)
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I know that one can embed RDFa in XHTML documents. Is there any standard accepted way to do this for PDF? (By “standard”, I mean in a way that major search engines recognize.)
Standard way to semantically tag data in a PDF document?
Yes, there is. It is called “Marked Content”. You can read about it in Chapter 10 – Document Interchange, Part 10.5 – Marked Content of the PDF Reference Sixth Edition