Special Section on Digital Libraries
Boolean query mapping across heterogeneous information sources
A knowledge-based approach for retrieving images by content
Picture similarity retrieval using the 2D projection interval representation
Tries for approximate string matching
WISE: a World Wide Web resource database system
An authorization model for a distributed hypertext system
Extending existing dependency theory to temporal databases
The Starburst active database rule system
A semiautomatic method for assigning elevation in contour maps
On satisfiability, equivalence, and implication problems involving conjunctive queries in database systems
The strong partial transitive-closure problem: algorithms and performance evaluation
Customizing transaction models and mechanisms in a programmable environment supporting reliable workflow automation
On the complexity of distributed query optimization
An architectural framework for CKBS applications