Intersection table representing the resolution of a many to many relationship.

shell_s (FSK, M: CHAR VARYING(19))
shell_t (M: CHAR VARYING(16))
face_s (FSK, M: CHAR VARYING(19))
face_t (M: CHAR VARYING(16))

face.shell
Defines the shells of which this face is a component.
shell.face
Defines the faces which compose this shell.
shell_s: Implements a foreign key to a row in one of the tables projected from entity shell depending on the value of the next column (See below).
shell_t: Defines the name of the referenced table. Possible values are: earth_pos_shl, other_shell, wellbore_shell (@shell).
face_s: Implements a foreign key to a row in one of the tables projected from entity face depending on the value of the next column (See below).
face_t: Defines the name of the referenced table. Possible values are defined in @face.