Keyphrases
- xml documents
- markup language
- relation algebra
- xml keys
- data exchange
- xml data
- data integration
- keyword search
- metadata
- xml schema
- xml retrieval
- databases
- xml queries
- relational database systems
- document centric
- xml format
- robot navigation
- object oriented databases
- expressive power
- data model
- semistructured data
- obstacle avoidance
- navigation systems
- structured data
- database systems
- distributive lattices