Language features for flexible handling of exceptions in information systems
ACM Transactions on Database Systems (TODS)
Object identity as a query language primitive
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Aspects: extending objects to support multiple, independent roles
SIGMOD '91 Proceedings of the 1991 ACM SIGMOD international conference on Management of data
Functional and predictive programming in OODB's
PODS '92 Proceedings of the eleventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
On the complexity of propositional knowledge base revision, updates, and counterfactuals
PODS '92 Proceedings of the eleventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Update semantics of relational views
ACM Transactions on Database Systems (TODS)
Dynamic Constraints and Object Migration
VLDB '91 Proceedings of the 17th International Conference on Very Large Data Bases
An Object Data Model with Roles
VLDB '93 Proceedings of the 19th International Conference on Very Large Data Bases
Clovers: The Dynamic Behavior of Types and Instances
Clovers: The Dynamic Behavior of Types and Instances
Semantic Granularity in Ontology-Driven Geographic Information Systems
Annals of Mathematics and Artificial Intelligence
COMPSAC '96 Proceedings of the 20th Conference on Computer Software and Applications
Evolving objects in temporal information systems
Annals of Mathematics and Artificial Intelligence
Temporal constraints for object migration and behavior modeling using colored petri nets
ER'00 Proceedings of the 19th international conference on Conceptual modeling
Tailoring temporal description logics for reasoning over temporal conceptual models
FroCoS'11 Proceedings of the 8th international conference on Frontiers of combining systems
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We study a mechanism that supports the migration of objects from one class of an OODB to another, thereby enabling us to model the same object playing different roles throughout its lifetime. Object migration may introduce typing conflicts due to the different typing constraints imposed by the classes. We present a coercion-like adaptation process that automatically resolves these conflicts. The process combines re-classification of objects and modification of attributes. We study the computational complexity of the problem, and show that the adaptation process can be performed efficiently in databases with covariant schemas.