Closure Properties of Certain Classes of Languages Under Generalized Morphic Replication.

Zhixi Fang Jitender S. Deogun

Published in: Comput. J. (1988)

Keyphrases

closure properties
expressive power
context free grammars
tree automata
conjunctive queries
query language
context free
databases
first order logic
integrity constraints
structural properties
finite automata
expert systems