Extensible Semantic Model Declarative datbase language
References:
Hainaut, Jean-Luc; Lecharlier, Baudouin "An Extensible Semantic Model of Data Base and Its Data language" pp1026-1030 view details in Rosenfeld, Jack L. (Ed.): Information Processing 74, Proceedings of IFIP Congress 74, Stockholm, Sweden, August 5-10, 1974 view details