Keyphrases
- xml data
- xml documents
- xml databases
- relational databases
- xml queries
- query optimization
- query processing
- data model
- query evaluation
- relational data
- query language
- querying xml data
- semi structured data
- relational and xml data
- keyword search
- path expressions
- xml schema
- xpath queries
- query decomposition
- xml query processing
- xml fragments
- standard for data exchange
- data structure
- xml trees
- databases
- semi structured information
- xml data sources
- native xml
- labeling scheme
- object oriented
- relational database systems
- regular expressions