383 search results - page 8 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
PODS
2007
ACM
14 years 7 months ago
2007
ACM
Query containment has been studied extensively for fragments of
CADE
2008
Springer
14 years 7 months ago
2008
Springer
Abstract. Conjunctive query answering plays a prominent role in applications of description logics (DLs) that involve instance data, but its exact complexity was a long-standing op...
VLDB
2004
ACM
14 years 25 days ago
2004
ACM
Query containment is the most fundamental relationship between a pair of database queries: a query Q is said to be contained in a query Q if the answer for Q is always a subset of...
OTM
2007
Springer
14 years 1 months ago
2007
Springer
We present a pragmatic extension of a Semantic Web query language (including so-called grounded conjunctive queries) with a termination safe functional expression language. This ad...
AAAI
2000
13 years 8 months ago
2000
A serious shortcoming of many Description Logic based knowledge representation systems is the inadequacy of their query languages. In this paper we present a novel technique that ...