Many Linked Data applications have come to rely on owl:sameAs for linking datasets. However, the current semantics for owl:sameAs assert that identity entails isomorphism, or that if a=b, then all statements of a and b are shared by both. This becomes problematic when dealing with provenance, context, and imperfect representations, all of which are endemic issues in Linked Data. Merging provena...

SQL, Prolog, RDF and OWL are among the most prominent and most widely used computational logic languages. SQL, Prolog and RDF do not allow to represent negative information, only OWL does so. RDF does even not include any negation concept. While SQL and Prolog only support reasoning with closed predicates based on negation-as-failure, OWL supports reasoning with open predicates based on classic...

SQL, Prolog, RDF and OWL are among the most prominent and most widely used computational logic languages. However, SQL, Prolog and RDF do not allow the representation of negative information, only OWL does so. RDF does not even include any negation concept. While SQL and Prolog only support reasoning with closed predicates based on negation-as-failure, OWL supports reasoning with open predicate...

With the rapid growth of user-created contents and wide use of community-based websites, content recommendation systems have attracted the attention of users. However, most recommendation systems have limitations in properly reflecting each user’s characteristics, and difficulty in recommending appropriate contents to users. Therefore, we propose a content recommendation method using Friend-Of-...

Sharing of bibliographic information is very important in a research community. SocioBiblog is a semantic blogging system that provides a decentralized environment to share bibliographic information. It uses the SWRC ontology for adding metadata about publications in blogs and aggregates publications from the social network neighborhood and coauthors of the researcher. RSS aggregation has been ...

In this paper, we propose P2Prec, a recommendation service for P2P content sharing systems that exploits users’ social data. The key idea is to recommend to a user high quality documents in a specific topic using ratings of friends (or friends of friends) who are expert in that topic. To manage users’ social data, we rely on Friend-Of-A-Friend (FOAF) descriptions. P2Prec has a h...

Web-based social networking applications gained considerable popularity in the recent years. However, most social networking platforms suffer from the limits of the centralized paradigm they adopted, limiting the mobility of their users, and their chances to benefit from diverse services. In this paper we want to illustrate how these limitations can be overcome by enabling a global naming servi...

In this paper we give an overview of the Foafing the Music system. The system uses the Friend of a Friend (FOAF) and RDF Site Summary (RSS) vocabularies for recommending music to a user, depending on the user’s musical tastes and listening habits. Music information (new album releases, podcast sessions, audio from MP3 blogs, related artists’ news and upcoming gigs) is gathered from thousands of...

For social networks, prediction of new links or edges can be important for many reasons, in particular for understanding future network growth. Recent work has shown that graph vertex similarity measures are good at predicting graph link formation for the near future, but are less effective in predicting further out. This could imply that recent links can be more important than older links in l...

The article describes attempts made to use data collected from online social network in the enterprise data warehouse. During our research we designed and developed sample independent system which can work in Data Staging Area of Data Warehouse to complement customer’s data with data from Facebook system using FOAF ontology.