Keyphrases
- xml data
- data model
- xml documents
- efficient query processing
- xml databases
- semi structured data
- xml schema
- relational databases
- structured data
- regular path expressions
- query optimization
- relational data
- native xml databases
- xml queries
- keyword search
- xpath queries
- query processing
- query evaluation
- database
- information retrieval
- query language
- relational database systems
- path expressions
- directed graph
- relational and xml data
- hierarchical data
- graph databases
- xml views
- semi structured information
- querying xml data
- inverted index
- directed acyclic graph
- data integration
- database systems
- xpath expressions
- xml fragments
- relational tables
- xml data sources
- database schema
- functional dependencies