Keyphrases
- xml documents
- xml data
- relational databases
- xml schema
- xml databases
- xpath queries
- owl ontologies
- relational data
- integrity constraints
- structured data
- xml queries
- sql queries
- semantic web technologies
- data model
- semantic web
- content and structure
- semi structured data
- labeling scheme
- path expressions
- xml information retrieval
- keyword search
- search engine
- knowledge base