Keyphrases
- path expressions
- xml data
- xml documents
- complex objects
- object oriented databases
- semi structured data
- xml queries
- cost model
- query language
- semistructured data
- regular expressions
- first order logic
- relational databases
- query processing
- xpath queries
- query execution
- structured data
- xml databases
- relational database systems
- databases
- data structure
- data model
- machine learning