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%alternatives-display.class; Alternatives Display Class Elements

Display elements that can be alternatives to each other inside an <alternatives> element.
Declaration
<!ENTITY % alternatives-display.class
                        "array | chem-struct | code | graphic |
                         inline-graphic | inline-media | 
                         inline-supplementary-material |
                         media | preformat | private-char |
                         supplementary-material | table |
                         textual-form"                               >