Discovering diversified paths in knowledge bases

Abstract

Vast amounts of world knowledge is now accessible through Knowledge Graphs (KGs) in RDF format and can be queried using SPARQL. Yet, finding paths between nodes in such graphs is not part of the official SPARQL 1.1 standard; only the simpler functionality of checking reachability is supported, i.e., assessing whether two nodes are connected based on certain conditions formalized as property paths but without providing information on how they are actually connected. To close this gap of functionality, we present J edi , a system that extends a popular SPARQL engine, Jena, with the ability to compute paths connecting entities in a KG. J edi shows the k most relevant results to the user where relevance is assessed as a trade-off between path length and diversification of the intermediate nodes in the path. Furthermore, our solution is not limited to a single property path pattern but supports queries containing multiple property path patterns. While J edi supports arbitrary KGs, for demonstration purposes some predefined KGs, such as YAGO and DBLP, will be used.