The EML Package Module is a wrapper describing a set of data or metadata files and the relationships among those component objects. This should contain contact information for anyone who has contributed to this package. A triple allows a user to define a relationship between two objects. This relationship can also be recursive so that an object can point back to the package of which it is a part.
Subject is the identifier of the metadata object or file that is the actor in the triple.
Object is the identifier of the metadata or data object that is acted upon according to the relationship in the triple. The object element was introduced in EML 2.0.