Keyphrases
- data model
- query language
- database systems
- semi structured
- relational model
- object oriented
- data modeling
- databases
- database design
- data integration
- database management systems
- database
- data types
- semistructured data
- data sources
- conceptual model
- xml documents
- website
- relational data model
- relational algebra
- object model
- entity relationship
- logical data model
- xml data
- expert systems
- information systems