383 search results - page 24 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
PODS
2004
ACM
14 years 8 months ago
2004
ACM
We study the problem of answering queries over sources with limited access patterns. Given a first-order query Q, the problem is to decide whether there is an equivalent query whi...
ODBIS
2007
Springer
14 years 2 months ago
2007
Springer
Abstract. RDF Schema (RDFS) extends RDF with a schema vocabulary with a predeļ¬ned semantics. Evaluating queries which involve this vocabulary is challenging, and there is not yet...
MFCS
2009
Springer
14 years 3 months ago
2009
Springer
We study visibly pushdown automata (VPA) models for expressing and evaluating queries, expressed using MSO formulas, on words with a nesting structure (like XML documents). We deļ...
DKE
2007
13 years 8 months ago
2007
We introduce parameterized pattern queries as a new paradigm to extend traditional pattern expressions over sequence databases. A parameterized pattern is essentially a string mad...
ICDE
2006
IEEE
14 years 10 months ago
2006
IEEE
The XPath language incorporates powerful primitives for formulating queries containing nested subexpressions which are existentially or universally quantified. However, even the b...