Keyphrases
- xpath queries
- xml data
- xml documents
- xml databases
- data model
- query evaluation
- relational databases
- query optimization
- xml queries
- xml schema
- query processing
- query language
- semi structured data
- xml streams
- query rewriting
- relational data
- xml fragments
- path expressions
- relational database systems
- external memory
- xpath expressions
- data structure
- labeling scheme
- keyword search
- information retrieval
- querying xml data
- xml views
- cost model
- object oriented databases