In this paper we rst review the main results in the theory of schemata in Genetic Programming (GP) and summarise a new GP schema theory which is based on a new deenition of schema. Then we study the creation, propagation and disruption of this new form of schemata in real runs, for standard crossover, one-point crossover and selection only. Finally, we discuss these results in the light our GP ...

In this paper we first review the main results in the theory of schemata in Genetic Programming (GP) and summarise a new GP schema theory which is based on a new definition of schema. Then we study the creation, propagation and disruption of this new form of schemata in real runs, for standard crossover, one-point crossover and selection only. Finally, we discuss these results in the light our ...

Developing a declarative approach to schema integration in the context of heterogeneous database systems is a major goal of this research. We take a rst step toward this goal in this paper, by developing a simple logic called SchemaLog which is syntactically higher-order but has a rst-order semantics. SchemaLog can provide for a logical integration of multiple relational databases in a federati...