ontoMDE-core is basically a library for loading a RDFS model in ruby memory and process it to do something usefull such as generating Java or C++ code. ontoMDE-core is used by ontoMDE-uml2 which adds UML2 meta-model definitions and some helper methods. ontoMDE-uml2 is in turn used by ontoMDE-uml2-java which adds methods and rules to generate java5 code. But ontoMDE-core is *not* *UML* *specific* and can be used with *any* RDF[http://en.wikipedia.org/wiki/Resource_Description_Framework] / RDFS[http://en.wikipedia.org/wiki/RDF_Schema] model such as those created with Protege_2000[http://protege.stanford.edu]. This opens to ontoMDE-core users the ability to generate code from custom DSL[http://en.wikipedia.org/wiki/Domain_Specific_Language] models, or join different models. This gem bundles, ontomde-inspector which is a web server for browsing a model and a meta-model inside a running ontomde generator. Inspector is available as an independant script but may also be run from generator (such as ontomde-java with option --inspector or --inspectorAfterLoad ) to provide a view of model before or after generation.