383 search results - page 48 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
ICDT
2005
ACM
14 years 2 months ago
2005
ACM
We give two sufficient conditions on XPath like languages for having first order expressivity, meaning that every first order definable set of paths in an ordered node-labeled t...
DEXAW
2005
IEEE
13 years 10 months ago
2005
IEEE
In this paper, we study semistructured data and indexes preserving inclusion constraints. A semistructured datum is modelled by multi-rooted edge-labeled directed graphs. We consi...
KRDB
2003
13 years 10 months ago
2003
Keyword-based web query languages suffer from a lack of precision when searching for a precise kind of documents. Indeed, some documents cannot be simply characterized by a list o...
PVLDB
2008
13 years 8 months ago
2008
We describe XTreeNet, a distributed query dissemination engine which facilitates democratization of publishing and efficient data search among members of online communities with p...
SIGMOD
2008
ACM
13 years 8 months ago
2008
ACM
The presence of encyclopedic Web sources, such as Wikipedia, the Internet Movie Database (IMDB), World Factbook, etc. calls for new querying techniques that are simple and yet mor...