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Tagged PDF - Document::enableTagging() accumulates a logical structure tree and emits /StructTreeRoot, /MarkInfo, the ParentTree and per-page /StructParents. Opt-in; byte-identical output when off.
PDF/UA-1 conformance - Document::enablePdfUA() produces output that validates isCompliant under the veraPDF PDF/UA-1 profile: artifacts, figure alternate text, header-cell /Scope, DisplayDocTitle, an XMP pdfuaid packet, and a fail-fast conformance guard.
Tagged hyperlinks - text links (cell(link:, linkAlt:)), Markdown inline links, and image links (image(link:, linkAlt:) and Markdown [](url)) are tagged as <Link> structure elements wrapping their content, with /OBJR, /StructParent and /Contents. Markdown block images now carry /Alt.
PDF/A level A - enablePdfA(PdfALevel::A2A) and A3A emit PDF/A-2a / PDF/A-3a (Unicode requirements plus a tagged structure tree). Combining with enablePdfUA() yields a single file that is both PDF/A-2a and PDF/UA-1. This completes PDF/A level support (B, U, A across parts 2 and 3).