Keyphrases
- xml documents
- ranking scheme
- data synopses
- xml queries
- keyword search
- ranking algorithm
- massive data sets
- xml data
- query language
- data model
- ranking functions
- relational databases
- web search
- databases
- xml trees
- query expansion
- structured data
- xml schema
- xml databases
- database
- keyword queries
- relational data
- multi dimensional
- search engine
- web pages
- query processing
- language model
- integrity constraints
- semantic information
- sql queries
- learning to rank
- object oriented
- indexing scheme
- retrieval systems