Keyphrases
- xml documents
- information retrieval
- structured data
- structured queries
- structured documents
- xml data
- xml information retrieval
- xml schema
- xml files
- relational databases
- semi structured data
- xml databases
- information retrieval systems
- search engine
- tree structured data
- content and structure
- information extraction
- keyword search
- data model
- xml queries
- vector space model
- text mining
- integrity constraints
- semantic information
- language model
- information access
- retrieval model
- query expansion
- database
- relational data
- multi dimensional
- test collection
- relevance feedback
- document collections
- xml ir