Keyphrases
- labeling scheme
- xml query processing
- efficient processing
- parent child
- query processing
- insertions and deletions
- xml trees
- relational tables
- xml data
- reachability queries
- xml documents
- query language
- database
- query evaluation
- range queries
- web search engines
- path expressions
- user queries
- information extraction
- xml databases
- tree patterns
- data management
- data sources
- database systems