private void reset(){
        elementStack.clear();
        materialList = null;
        ignoreItem = false;
    }
This is a utility class to load a {@link MaterialList} from a 
.scene file. It is only needed because the parsing method
used by the SceneLoader doesn't support reading bottom XML nodes
before reading the top nodes.

@author Kirill Vainer
jme3-plugins/src/ogre/java/com/jme3/scene/plugins/ogre/SceneMaterialLoader.java