Keyphrases
- xml data
- semi structured data
- standard for data exchange
- xml documents
- data model
- xml queries
- query processing
- xml databases
- relational databases
- query optimization
- relational data
- query decomposition
- keyword search
- xml schema
- query evaluation
- query language
- xpath queries
- web mining
- relational and xml data
- querying xml data
- web documents
- semi structured information
- relational database systems
- path expressions
- information sources
- xml query processing
- extensible markup language
- xml data sources
- queries on xml data
- web data
- data warehouse
- web content
- native xml databases
- data management
- information extraction
- database systems
- databases
- database