@classmethod
def _clsinit(cls):
    """ ResourceManager classes have different attributes and traces.
        Attribute and traces are stored in 'class attribute' dictionaries.
        When a new ResourceManager class is created, the _clsinit method is 
        called to create a new instance of those dictionaries and initialize 
        them.
        
        The _clsinit method is called by the clsinit decorator method.
        
        """
    cls._attributes = dict()
    cls._register_attributes()
    cls._traces = dict()
    cls._register_traces()
