Defines what elements can occur within the Table Data Cell (XHTML table model) element in tables.
<!ENTITY % td.content "( #PCDATA | %Flow.mix; )*" >
( #PCDATA | email | ext-link | uri | hr | inline-supplementary-material | related-article | related-object | disp-formula | disp-formula-group | break | element-citation | mixed-citation | nlm-citation | bold | italic | monospace | overline | roman | sc | strike | underline | chem-struct | inline-formula | def-list | list | mml:math | abbrev | named-content | styled-content | graphic | media | preformat | inline-graphic | private-char | fn | target | xref | sub | sup )*
xhtml-table-1.mod