The "Contributor" class of our EMP ontology has been set as equivalent to the "Agent" class of the FOAF
(12), desarrollado para representar a personas y organizaciones con sus atributos y relaciones hacia otros conceptos.
This emerging web of data includes data sets as extensive and diverse as DBpedia, Geonames, US Census, EuroStat, MusicBrainz, BBC Programmes, Flickr, DBLP, PubMed, UniProt, FOAF
, SIOC, OpenCyc, UMBEL, Virtual Observatories, and Yago.
Golbeck  studied the problem of propagating trust value in social networks, by proposing an extension of the FOAF
vocabulary  and algorithms to propagate trust values estimated by users rather than computed based on a clear count of pieces of evidence.
As input they integrated entities from two social networks, namely 'knows' from a FOAF
(Friend-of-a-Friend) social network and 'coauthor' from the underlying co-authorship network of the DBLP bibliography.
Types of connections n=261 Research Collaborator 21% Previous Supervisor 2% Internal Colleague 13% External Colleague 18% Friend 21% Family 3% FOAF
3% Project member 2% Random 1% PhD student 3% Flatmate 0% Supervisor 8% Organisation 5% Note: Table made from pie graph.
For example, within an application, there should be specific code for handling FOAF
ontologies, code for handling the cranberry sauce ontology should be downloadable from the cranberry sauce community web page, and information such as printer information on the cranberry sauce label should only be text so it can be cut and pasted into a spreadsheet, if required.
A more recent semantic web inspired approach is to ask online users to write FOAF
(Friend of a friend) files to describe themselves (http://www.