The Citation Typing Ontology is an ontology for the characterization of citations, both factually and rhetorically. It forms part of SPAR, a suite of Semantic Publishing and Referencing Ontologies.
Knoodl facilitates community-oriented development of OWL based ontologies and RDF knowledgebases. It also serves as a semantic technology platform, offering a JAVA service-based interface or a SPARQL-based interface so that communities can build their own semantic applications using their ontologies and knowledgebases.
O. Kutz, J. Hastings, and T. Mossakowski. 15th International Conference on Artificial Intelligence: Methodology, Systems, Applications, volume 7557 of Lecture Notes in Computer Science, page 103-111. Springer, (2012)