Keyphrases
- tree structure
- aggregate queries
- tree structures
- aggregation functions
- data cube
- data structure
- efficient computation
- tree representation
- query processing
- probabilistic xml
- xml documents
- hierarchical structure
- r tree
- index structure
- approximate answers
- frequent patterns
- quadtree
- association rule mining
- sliding window
- real world
- neural network
- databases
- database