Keyphrases
- xml documents
- query language
- data model
- xml query languages
- xml data
- xml queries
- expressive power
- relational algebra
- structured data
- xml databases
- path expressions
- semi structured data
- xml schema
- object oriented
- future directions
- complex objects
- query evaluation
- semistructured data
- relational databases
- keyword search
- database
- relational data
- conjunctive queries
- xpath queries
- data integration
- functional dependencies
- relational tables
- recursive queries
- database management systems
- constraint databases
- content and structure
- regular expressions
- integrity constraints
- conceptual model
- query optimization
- structured documents
- semi structured
- document type
- rdf data
- query interface
- relational database systems
- multi dimensional
- metadata
- search engine
- databases