95 search results - page 15 / 19 » The Complexity of Conjunctive Query Answering in Expressive ... |
CORR
2007
Springer
13 years 7 months ago
2007
Springer
The Semantic Web drives towards the use of the Web for interacting with logically interconnected data. Through knowledge models such as Resource Description Framework (RDF), the S...
SEMWEB
2009
Springer
14 years 2 months ago
2009
Springer
Abstract. This paper presents a decidable fragment for combining ontologies and rules in order-sorted logic programming. We describe ordersorted logic programming with sort, predic...
DLOG
2006
13 years 9 months ago
2006
On the Semantic Web, there has been increasing demand for a ruleslike expressivity that goes beyond OWL-DL. Efforts of combining rules languages and description logics usually pro...
PODS
2009
ACM
14 years 8 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 ...
PODS
2003
ACM
14 years 7 months ago
2003
ACM
A query against a database behind a site like Napster may search, e.g., for all users who have downloaded more jazz titles than pop music titles. In order to express such queries,...