Abstract: When attempting to build a scaleable Semantic Web application, one has to know about the size of the Semantic Web. In order to be able to understand the characteristics of the Semantic Web, we examined an interlinked dataset acting as a representative proxy for the Semantic Web at large. Our main finding was that regarding the size of the Semantic Web, there is more than the sheer number of triples; the number and type of links is an equally crucial measure.

Abstract. The friend of a friend (FOAF) vocabulary is widely used on the Web to describe ’agents ’ (people, groups and organizations) and their properties. Since FOAF does not require unique ID for agents, it is not clear when two FOAF instances should be linked as co-referent, i.e., denote the same entity in the world. One approach is to use logical constraints such as the presence of inverse functional properties as evidence that two individuals are the same. Another applies heuristics based on the string similarity of values of FOAF properties such as name and school as evidence for or against co-reference. Performance is limited, however, by many factors: non-semantic string matching, noise, changes in the world, and the lack of more sophisticated graph analytics. We describe a prototype system that takes a set of FOAF agents and identifies subsets that are believed to be co-referent. The system uses logical constraints (e.g., IFPs), strong heuristics (e.g., FOAF agents described in the same file are not co-referent), and an SVM generated classifier. We present initial results using data collected from Swoogle and other sources and describe plans for additional analysis.