Keyphrases
- path expressions
- xml documents
- xml data
- complex objects
- cost model
- object oriented databases
- query language
- semi structured data
- xml queries
- semistructured data
- regular expressions
- query optimization
- xml databases
- relational database systems
- xpath queries
- search engine
- query execution
- relational databases
- multi dimensional
- sql queries
- information extraction
- data warehousing
- structured data