New draft version of the FRBRoo Model, version 2.4, encoded in RDFS

Note that this is NOT a definition of the FRBRoo Model, but an encoding derived from the draft release of the FRBRoo Model version 2.4 (November 2015) on this page

Classes and properties of the FRBRoo are identified by their initial codes followed by their english names, such as "F2_Expression" or "R2_is_derivative_of" or "R2i_has_derivative"