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PDFlib and Link tags

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From: Alan Zaitchik
Date: Oct 1, 2021 6:24AM

I've read that the PDFlib product cannot generate Link tags (although it does generate Link Annotations).
Their websites sample pdf file "link_annotations.pdf" has no tags at all, remarkably. (I checked in Acrobat and in PAC3.)
Yet both JAWS and NVDA see the links, can navigate to them and activate them.
Anyone with hands on ecperience using PDFlib to create interactive elements?
Anyone who can explain why the screenreaders seem unfazed by the absence of tags in general and Link tags in particular?
Thanks,
Alan