Content model for the <disp-formula> element.
<!ENTITY % disp-formula-model "(#PCDATA %disp-formula-elements;)*" >
(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | hr | 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 | abbrev | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | x | alt-text | long-desc | break | attrib | permissions | label | array | graphic | media | preformat)*
JATS-math1.ent