The development of the Internet in recent years has made it possible and useful to access
many different information systems anywhere in the world to obtain information. While there …

Provenance refers to the entire amount of information, comprising all the elements and their
relationships, that contribute to the existence of a piece of data. The knowledge of …

Crowdsourcing systems on the World-Wide Web Page 1 86 CommuniCations oF the aCm |
APRIL 2011 | vOL. 54 | nO. 4 review articles social systems, social search, social media …

DBpedia is a community effort to extract structured information from Wikipedia and to make
this information available on the Web. DBpedia allows you to ask sophisticated queries …

Relational databases have limited support for data collaboration, where teams
collaboratively curate and analyze large datasets. Inspired by software version control …

The most acute information management challenges today stem from organizations relying
on a large number of diverse, interrelated data sources, but having no means of managing …

This paper introduces\uldb s, an extension of relational databases with simple yet
expressive constructs for representing and manipulating both {\em lineage} and {\em …

We present OntoWiki, a tool providing support for agile, distributed knowledge engineering
scenarios. OntoWiki facilitates the visual presentation of a knowledge base as an …

Materialized views are queries whose results are stored and maintained in order to facilitate
access to data in their underlying base tables. In the SQL setting, they are now considered a …

The provenance of data has recently been recognized as central tothe trust one places in
data. It is also important to annotation, todata integration and to probabilistic databases …