Elements that may be used inside the content model of most highlighting elements (i.e., the Emphasis Rendition Class Elements)
<!ENTITY % emphasized-text "| %address-link.class; | %article-link.class; | %emphasis.class; | %inline-display.class; | %inline-math.class; | %phrase.class; | %simple-link.class; | %subsup.class;" >
articleauthcustom-mixes.ent