<!ENTITY % related-object-elements
                        "| %article-link.class; |
                         %appearance.class; | %break.class; |
                         %emphasis.class;  |
                         %inline-display.class; |
                         %inline-math.class; | %label.class; |
                         %math.class; | %phrase.class; |
                         %references.class; |
                         %simple-link.class; |
                         %subsup.class; | %x.class;"                 >

| inline-supplementary-material | related-article | related-object | hr | break | bold | fixed-case | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | serif | strike | underline | underline-start | underline-end | ruby | alternatives | inline-graphic | inline-media | private-char | chem-struct | inline-formula | label | tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end | milestone-start | named-content | styled-content | annotation | article-title | chapter-title | collab | collab-alternatives |comment | conf-acronym | conf-date | conf-loc | conf-name | conf-sponsor | data-title | date | date-in-citation | day | edition | email | elocation-id | etal | ext-link | fpage | gov | institution | institution-wrap | isbn | issn | issn-l | issue | issue-id | issue-part | issue-title | lpage | month | name | name-alternatives | object-id | page-range | part-title | patent | person-group | pub-id | publisher-loc | publisher-name | role | season | series | size | source | std | string-date | string-name | supplement | trans-source | trans-title | uri | version | volume | volume-id | volume-series | year | fn | target | xref | sub | sup | x