The Directory Record is based on the specification of Section F.3. It is identified by a Directory Record Type (0004,1430) of Value "STEREOMETRIC". Table F.5-35 lists the set of Keys with their associated Types for such a Directory Record Type. The description of these Keys may be found in the Modules related to the Stereometric Relationship IE of the Stereometric Relationship IOD. This Directory Record shall be used to reference a Stereometric Relationship SOP Instance. This type of Directory Record may reference a Lower-Level Directory Entity that includes one or more Directory Records as defined in Table F.4-1.