Keyphrases
- xml databases
- access control
- xml access control
- xml data
- relational databases
- xml documents
- fine grained
- dynamic access control
- semi structured
- xml queries
- security policies
- keyword search
- relational database systems
- access control models
- role based access control
- security requirements
- query engine
- access control mechanism
- trust model
- materialized views
- query processing
- databases
- access control policies
- structured data
- search engine
- xml schema
- information retrieval