Keyphrases
- keyword queries
- labeling scheme
- keyword search
- xml queries
- xml documents
- twig queries
- xml databases
- xml data
- path expressions
- inverted index
- structural join
- structured data
- query evaluation
- keywords
- relational databases
- information access
- semi structured
- xml keyword search
- xml trees
- structured queries
- content and structure
- keyword search in relational databases
- user queries
- structured databases
- search engine
- xml schema
- database schema
- index structure
- semi structured data
- graph structure
- query processing
- metadata
- information retrieval
- database
- normal form
- structured documents
- xpath queries
- data exchange
- multi dimensional
- object oriented
- query language
- digital libraries
- databases