RDF Graph-Based Formal System in Relation to the Sowa's Conceptual Graph

RDF model and Sowovy conceptual graphs are two different directions, although are based on the associative (semantic) networks. This article is a build on the author's work concerning the modified RDF graph-based model, which has a higher expressiveness. This article aims to start work on both formal systems and find common features for conversion. The reason this work is RDF, which is a data format designed to enable semantic interoperability between computers, and the largest part of its specification provides the means for this in defining the core vocabulary, an XML serialization, inferencing, etc.