High Quality Content by WIKIPEDIA articles! Soprano is a software library that provides an object-oriented C++/Qt4 framework for RDF data. Soprano was created as a sub project under the NEPOMUK project and forms a part of the semantic desktop in KDE Software Compilation 4. Soprano functions as a repository to store information generated by the NEPOMUK server (like ratings, tags or comments), which will then be indexed by Strigi for better search results..