A female terminal includes a tubular portion which has a square tubular shape and receives a male terminal therein and a resilient member which is provided in the tubular portion so as to urge the male terminal toward an inner surface of the tubular portion. When a data link module is inserted in a cage, a housing tongue and a through hole both formed in a bottom plate of the housing are overlapped with a cage tongue and a lock pin both provided in and on a bottom plate of the cage, into and from which the data link module is inserted and removed, such that the lock pin is engaged in and locked by the lock hole. A query abstraction layer is also provided and is based on the data repository abstraction layer. An insulating layer pattern is formed in the trenches and an area between the mask patterns. 5 multiplied by the cross-section area.