RegisteredRTOSLibrary[] rtos = RegisteredRTOSLibrary.getRegisteredLibraries();
			
	URI modelUri = rtos[0].uri;
	ResourceSet resourceSet = new ResourceSetImpl();
	Resource inResources = resourceSet.getResource( modelUri, true);		

import org.eclipse.emf.ecore.util.EcoreUtil;

Collection<Class> classes = EcoreUtil.getObjectsByType(iterator2Collection(model.eResource().getAllContents()), UMLPackage.eINSTANCE.getClass_());

for(Class c:classes){
 for(Stereotype s:c.getAppliedStereotypes()){
  if(s.getName().startsWith("MARTE")){
   //do something
  }
 } 
}

    /**
     * @see de.cau.cs.kieler.core.model.util.ModelingUtil
     */
    public static <T> Collection<T> iterator2Collection(final Iterator<T> iter) {
        ArrayList<T> list = new ArrayList<T>();
        for (; iter.hasNext();) {
            T item = iter.next();
            list.add(item);
        }
        return list;
    }