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

facility_s (FSK, M: CHAR VARYING(19))
facility_t (M: CHAR VARYING(16))
app_for_prmt_s (FSK, M: CHAR VARYING(19))

application_for_permit.facility
This defines the facilities that are the subjects of the application for permit.
facility.application_for_permit
These are the applications for permit which have been submitted for this facility.
facility_s: Implements a foreign key to a row in one of the tables projected from entity facility depending on the value of the next column (See below).
facility_t: Defines the name of the referenced table. Possible values are defined in @facility.
app_for_prmt_s: Defines a foreign key to table app_for_prmt.