Keyphrases
- xml data
- xml documents
- xml databases
- xml queries
- data model
- approximate query answering
- relational databases
- query processing
- query optimization
- query language
- xml schema
- relational data
- query evaluation
- xml elements
- query decomposition
- keyword search
- information retrieval
- retrieval systems
- relational and xml data
- xpath queries
- image database
- path expressions
- querying xml data
- document retrieval
- relational database systems
- xml query processing
- xml fragments
- native xml databases
- information retrieval systems
- semi structured information
- relevance feedback
- image retrieval
- semi structured
- query expansion
- xml data sources