An amateur's introduction to recursive query processing strategies
SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
PODS '87 Proceedings of the sixth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
On the declarative semantics of deductive databases and logic programs
Foundations of deductive databases and logic programming
A procedural semantics for well founded negation in logic programs
PODS '89 Proceedings of the eighth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Logic programming as constructivism: a formalization and its application to databases
PODS '89 Proceedings of the eighth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Bottom-up beats top-down for datalog
PODS '89 Proceedings of the eighth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Inference of monotonicity constraints in datalog programs
PODS '89 Proceedings of the eighth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
The well-founded semantics for general logic programs
Journal of the ACM (JACM)
Efficient bottom-up computation of queries on stratified databases
Journal of Logic Programming
Modular acyclicity and tail recursion in logic programs
PODS '91 Proceedings of the tenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
On negation in HiLog (extended abstract)
PODS '91 Proceedings of the tenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
The valid model semantics for logic programs
PODS '92 Proceedings of the eleventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Monotonic aggregation in deductive databases
PODS '92 Proceedings of the eleventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
An alternating fixpoint tailored to magic programs
PODS '93 Proceedings of the twelfth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Design and implementation of the glue-nail database system
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
XSB as an efficient deductive database engine
SIGMOD '94 Proceedings of the 1994 ACM SIGMOD international conference on Management of data
A three-valued semantics for deductive databases and logic programs
Journal of Computer and System Sciences
Modular stratification and magic sets for Datalog programs with negation
Journal of the ACM (JACM)
An introduction to deductive database languages and systems
The VLDB Journal — The International Journal on Very Large Data Bases - Prototypes of deductive database systems
The glue-nail deductive database system: design, implementation, and evaluation
The VLDB Journal — The International Journal on Very Large Data Bases - Prototypes of deductive database systems
The VLDB Journal — The International Journal on Very Large Data Bases - Prototypes of deductive database systems
A Deductive Environment for Dealing with Objects and Nonmonotonic Reasoning
IEEE Transactions on Knowledge and Data Engineering
Efficient Recursive Aggregation and Negation in Deductive Databases
IEEE Transactions on Knowledge and Data Engineering
Enhancing Disjunctive Datalog by Constraints
IEEE Transactions on Knowledge and Data Engineering
The Magic of Duplicates and Aggregates
VLDB '90 Proceedings of the 16th International Conference on Very Large Data Bases
CORAL - Control, Relations and Logic
VLDB '92 Proceedings of the 18th International Conference on Very Large Data Bases
Coral++: Adding Object-Orientation to a Logic Database Language
VLDB '93 Proceedings of the 19th International Conference on Very Large Data Bases
Experimenting with recursive queries in database and logic programming systems
Theory and Practice of Logic Programming
Four lessons in versatility or how query languages adapt to the web
Semantic techniques for the web
Modifying Intensional Logic Knowledge
Fundamenta Informaticae
Logic and lattices for distributed programming
Proceedings of the Third ACM Symposium on Cloud Computing
Foundations of rule-based query answering
RW'07 Proceedings of the Third international summer school conference on Reasoning Web
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We propose a class of programs, called modularly stratified programs that have several attractive properties. Modular stratification generalizes stratification and local stratification, while allowing programs that are not expressible by stratified programs. For modularly stratified programs the well-founded semantics coincides with the stable model semantics, and makes every ground literal true or false. Modularly stratified programs are all weakly stratified, but the converse is false. Unlike some weakly stratified programs, modularly stratified programs can be evaluated in a subgoal-at-a-time fashion. We demonstrate a technique for rewriting a modularly stratified program for bottom-up evaluation and extend this rewriting to include magic-set techniques. The rewritten program, when evaluated bottom-up, gives the same answers as the well-founded semantics. We discuss extending modular stratification to other operators such as set-grouping and aggregation that have traditionally been stratified to prevent semantic difficulties.