- identification as a primitive of database models
- deontic action programs
- marked nulls in queries
- topological canonization in spatial databases
- complexity of search queries
- complexity of Web queries
- attribute grammars for structured document queries
- hybrid multi-level concurrency control
- efficient navigation in persistent object stores
- formal semantics of UML
- reengineering of object bases and integrity dependence
Fundamentals of Information Systems serves as an excellent reference, providing insight into some of the most challenging research issues in the field.