Keyphrases
- semistructured data
- query language
- tree patterns
- semistructured databases
- data model
- path expressions
- regular expressions
- regular path queries
- semi structured
- query evaluation
- structured data
- database
- query processing
- relational algebra
- raw data
- recursive queries
- conceptual model
- data sources
- relational database systems
- query logs
- range queries
- object oriented
- transitive closure
- query containment
- database systems