Bag-based data models for incomplete information and their closure properties.
Akinari YamaguchiShougo ShimizuYasunori IshiharaToru FujiwaraPublished in: J. Intell. Inf. Syst. (2008)
Keyphrases
- incomplete information
- closure properties
- data model
- query language
- relational model
- expressive power
- conjunctive queries
- query answering
- first order logic
- context free grammars
- tree automata
- databases
- database systems
- relational algebra
- partial information
- object oriented
- data integration
- database design
- database
- missing information
- autonomous agents
- data sources
- xml documents
- conceptual model
- structural properties
- xml data
- context free
- query evaluation
- finite automata
- regular expressions
- fuzzy logic
- answering queries
- repeated games