Keyphrases
- semi structured
- data model
- semistructured data
- query language
- databases
- data integration
- database systems
- relational model
- object oriented
- database management systems
- database
- data extraction
- web data
- data sources
- semi structured data
- structured data
- web data sources
- relational algebra
- unstructured data
- semistructured databases
- text mining
- conceptual model
- xml documents
- tree structured patterns
- semistructured documents
- xml data
- query evaluation
- data exchange
- integrity constraints
- knowledge representation
- machine learning