Object-oriented, Pascal style, handles sets. "A Data Model and Query Language for EXODUS", M.J. Carey et al, SIGMOD 88 Conf Proc, pp.413- 423, ACM SIGMOD Record 17:3 (Sept 1988).
EXTRA
Meaning of EXTRA in English
FOLDOC computer English dictionary. Английский словарь по компьютерам FOLDOC. 2012