Content Model

<!ENTITY % chem-struct-elements
                        "| %access.class; |  %all-phrase; | 
                         %break.class; | %id.class; | 
                         %label.class; | %list.class; | 
                         %simple-display-noalt.class;"               >

Expanded Content Model

| alt-text | long-desc | 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 | break | object-id | label | def-list | list | array | graphic | media | preformat