33 search results - page 1 / 7 » First-order complete and computationally complete query lang... |
DBPL
2001
Springer
14 years 3 months ago
2001
Springer
Abstract. We address a fundamental question concerning spatio-temporal database systems: “What are exactly spatio-temporal queries?” We define spatio-temporal queries to be co...
TOCL
2008
13 years 11 months ago
2008
ICDT
2009
ACM
14 years 11 months ago
2009
ACM
Marx and de Rijke have shown that the navigational core of the w3c XML query language XPath is not first-order complete ? that is it cannot express every query definable in firsto...
ICDT
2007
ACM
14 years 5 months ago
2007
ACM
Moving objects produce trajectories. We describe a data model for trajectories and trajectory samples and an efficient way of modeling uncertainty via beads for trajectory samples....
PODS
2009
ACM
14 years 11 months ago
2009
ACM
The paper investigates the question of whether a partially closed database has complete information to answer a query. In practice an enterprise often maintains master data Dm, a ...