/// </summary>
private static void RegisterRepresentations()
{
if (!REPRS_Registered)
{
REPRRegistry.register_REPR("KnowHOWREPR", new KnowHOWREPR());
REPRRegistry.register_REPR("P6opaque", new P6opaque());
REPRRegistry.register_REPR("P6hash", new P6hash());
REPRRegistry.register_REPR("P6int", new P6int());
REPRRegistry.register_REPR("P6num", new P6num());
REPRRegistry.register_REPR("P6str", new P6str());