<!ENTITY % related-object-elements
                        "| %emphasis.class; |
                         %phrase-content.class; |
                         %references.class; |  %subsup.class;"       >

| bold | fixed-case | italic | monospace | overline | roman | sans-serif | sc | strike | underline | ruby | 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 | sub | sup