On the Expressive Power of XQuery Fragments.
Jan HiddersStefania MarraraJan ParedaensRoel VercammenPublished in: DBPL (2005)
Keyphrases
- expressive power
- query language
- data complexity
- relational algebra
- data model
- xml data
- computational properties
- transitive closure
- query evaluation
- xml documents
- guarded fragment
- complex objects
- database
- first order logic
- relational calculus
- path expressions
- query processing
- relation algebra
- regular expressions
- database query languages