Content model for an <inline-formula> element
<!ENTITY % inline-formula-model "(#PCDATA %inline-formula-elements;)*" >
(#PCDATA | bold | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | alternatives | inline-graphic | private-char | chem-struct | inline-formula | tex-math | mml:math | named-content | styled-content | sub | sup)*
math3.ent