| D. DeGroot and G. Lindstrom, editors. Functional and Logic Programming. Prentice Hall, 1986. |
....more liberal with respect to its type system e.g. by allowing sort expressions involving features and roles, PROTOS L sticks to Horn clauses and sort constants, but allows additionally parametric sorts. There are various approaches to enrich in particular logic programming with types (see e.g. [DeGroot and Lindstrom, 1986]) An integration of parametric polymorphism as in ML [Harper et al. 1986] with Prolog was suggested in [Mycroft and O Keefe, 1984] Ordersorted type concepts were developed by Goguen et al. and are present in OBJ [Futatsugi et al. 1985] and Eqlog [Goguen and Meseguer, 1986] Huber and Varsek, ....
D. DeGroot and G. Lindstrom, editors. Functional and Logic Programming. Prentice Hall, 1986.
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