A Protégé “frame.” This screen capture shows a frame in Protégé representing the class in RadLex (a RadLex term). The class contains several slots (attributes the contained values), such as a preferred name of “supraaortic valve area,” an internal RadLex identifier name (“RID482”), a version number, definition, and other information such as the arterial segment of which it is a part, synonyms, and other information about the term.