Drug name Member relationship that defines the class Relationship "isa" indicates that classId1 designates a subclass of classId2 Class or drug name Class identifier (an ID in the namespace of the class source) Class1's identifier (an ID in the namespace of the class source) Class2's identifier (an ID in the namespace of the class source) Class name Class type (ATC1-4, CHEM, DISPOS, EPC, VA, etc.) ORTHOGONAL Collection of classes and edges Edge Link to the class source Drug class Drug class Drug that is a class member Fact about the drug's membership in the class RxNorm identifier Attribute name (SourceId, SourceName, Relation, SourceUrl) Attribute value Drug term type RxNorm identifier of an ingredient Drug classes Drug class and its similarity stats Compared class Similarity stats Degree of overlap of two classes Degree to which one compared class includes the other Number of drugs common to both classes Number of drugs in class 1 Number of drugs in class 2 Drug-member relationship source Relationship source Class type "true" or "false" - whether the drug is a member of class 1 "true" or "false" - whether the drug is a member of class 2 Version of the data set that declares the drug-class relations