adding {HEAD ~ a column} to the relational database table created for the other semantic object to hold a foreign key that links the relational database table created for the other semantic object to {TAIL ~ the relational database table} created for the first semantic object if the maximum cardinality properties of the object link attributes associated with the first semantic object and with the other semantic object are both less than or equal to one; or 
adding { HEAD ~ a column } to the relational database table created for the other semantic object to hold a foreign key that links the relational database table created for the other semantic object to { TAIL ~ the relational database table } created for the first semantic object if the maximum cardinality properties of the object link attributes associated with the first semantic object and with the other semantic object are both less than or equal to one ; or
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH