%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.
Model
<!ENTITY % phrase.class "abbrev | index-term | index-term-range-end | milestone-end | milestone-start | named-content | styled-content" >