Keyphrases
- xml data
- xml query processing
- path expressions
- xml queries
- xml documents
- xml databases
- data model
- query optimization
- native xml databases
- relational data
- query processing
- xml schema
- semi structured data
- xml query languages
- query evaluation
- relational databases
- query language
- object oriented
- relational database systems
- keyword search
- cost model
- xpath queries
- twig queries
- structural join
- labeling scheme
- join algorithms
- complex objects
- database systems
- data mining
- databases
- database