Content Model

<!ENTITY % disp-formula-elements
                        "| %access.class; | %address-link.class; |
                         %break.class; | %emphasis.class; |
                         %inline-display-noalt.class; |
                         %inline-math.class; | %label.class; |
                         %phrase-content.class; |
                         %math.class; |  %simple-display.class; |
                         %subsup.class;"                             >

Expanded Content Model

| alt-text | long-desc | email | ext-link | uri | break | bold | italic | monospace | overline | roman | sans-serif | sc | strike | underline | inline-graphic | private-char | chem-struct | inline-formula | label | named-content | styled-content | tex-math | mml:math | alternatives | array | graphic | media | preformat | sub | sup