Several metadata schemas focusing on Dublin Core metadata are now in operation around the world. In this demonstration, we support participants in exploring various components that make up the IEMSR metadata schema registry: a desktop tool enabling creation of simple DC vocabularies and application profiles and their addition to the registry; a Web client that enables the registry to be browsed and searched; a series of prototype tools that demonstrate the use of the machine-to-machine SPARQL endpoint for practical scenarios such as internationalization and complex application profile creation using an explicitly stated entity-relationship model.