Keyphrases
- path expressions
- xml data
- query language
- xml query languages
- query processing
- xml documents
- xml queries
- query evaluation
- query optimization
- xpath queries
- xml query processing
- xml databases
- data model
- regular path expressions
- recursive queries
- semi structured data
- relational databases
- xml schema
- relational data
- query result
- cost model
- complex objects
- relational database systems
- native xml databases
- regular expressions
- keyword search
- querying xml data
- tree patterns
- semistructured data
- query optimizer
- xpath expressions
- efficient processing
- relational algebra
- object oriented databases