MathML Namespace (temp actualtext moved to content element in new code) \s*(([\-+]?[0-9]*([0-9]\.?|\.[0-9])[0-9]*(r?em|ex|in|cm|mm|p[xtc]|Q|v[hw]|vmin|vmax|%))|0)\s* P Span Note PDF StructTreeRoot AssociatedFile AssociatedFile AssociatedFile PDF/UA-1 1 share with pdf1.7 version from here to end XMP PDF structure Namespace Block Inline Before Start End LrTb RlTb TbRl TbLr LrBt RlBt BtRl BtLr Start Center End Justify Underline Overline LineThrough Sup Sub Normal None Unordered Description Disc Circle Square Ordered Decimal UpperRoman LowerRoman UpperAlpha LowerAlpha Document Level Document DocumentFragment Grouping Part Sect Aside NonStruct Div Block P H1 H2 H3 H4 H5 H6 H7 H Title FENote BibEntry Sub Block Sub Inline Lbl Em Strong Span Link Annot Form Ruby Ruby Start Center End Justify Distribute Before After Warichu Inline RB Start Center End Justify Distribute Before After Warichu Inline RT Start Center End Justify Distribute RP Warichu WT WP Lists L LI LBody Index Tables Table THead TBody TFoot TR TH Before Middle After Justify Start Center End Column Row Both TD Before Middle After Justify Start Center End Caption Figure Formula Formula Artifact Artifact PDF1 Art Private TOC TOCI Note Reference Code BlockQuote Quote