Keyphrases
- twig queries
- encoding scheme
- probabilistic xml
- query evaluation
- xml data
- xml queries
- efficient processing
- twig pattern
- xml databases
- information retrieval systems
- join algorithms
- xml documents
- pattern queries
- digital libraries
- query processing
- xml query processing
- labeling scheme
- path expressions
- retrieval systems
- xml schema
- data structure
- external memory
- xml query languages
- integrity constraints
- multi dimensional