Comparison of the Expressive Power of Language-Based Access Control Models.

Yoshiaki Takata Hiroyuki Seki

Published in: IEICE Trans. Inf. Syst. (2009)

Keyphrases

expressive power
query language
data complexity
relational calculus
relational algebra
first order logic
computational properties
aggregate functions
database query languages
database
natural language
xml documents
relational query languages