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%inside-chem-struct-wrap.class; Inside Chemical Structure Elements

Very similar to the Simple Display Class Elements, but for use inside <chem-struct-wrap>, so it can contain both <chem-struct> and <textual-form>.
Declaration
<!ENTITY % inside-chem-struct-wrap.class
                        "alternatives | chem-struct | code | graphic |
                         media | preformat | textual-form"           >