%phrase.class; Phrase Class Elements

Small inline elements that surround a word or phrase in text because the subject (content) should be identified, such as the <named-content> element to identify a drug name, genus/species, product, etc.
Declaration
<!ENTITY % phrase.class "abbrev | 
                         index-term | index-term-range-end |
                         milestone-end | milestone-start |
                         named-content | styled-content"             >