Quality is a specific attribute that is strongly associated with an entity, but whose values are varying and disjunct. Qualities are finite enumerations, such as sex ("Female", "Male", "Hermaphrodite"), heritage ("Maternal", "Paternal"), but they also make use of the "has value" datatype property such as "Coding Frame Offset" (either "0", "1" or "2"). For encoding numerical qualities, see "Base Quality" and "Mapping Quality", or, "Phred Score" and "Conditional Genotype Quality", which are sub-classes of "Score".