OntoGui is developed as a desktop application in C++ making use of wxWidgets Cross-Platform GUI Library [2] for the creation of graphical elements, and the RdfCpp library. RdfCpp is a C++ library, based on Boost Library [3] and Redland RDF [4] (enabling the parsing and generation of RDF triples), that provides classes and functions to manage a network of RDF graphs, parse and generate OWL individuals, parse OWL axioms of a T-box (i.e., equivalent classes; subclasses; restrictions of any degree involving universal quantifier, existential quantifier, or cardinality constraints; domain and range of properties). Moreover, RdfCpp supports the connection with different RDF store solutions: (a) file-based; (b) Stardog triplestore [5].