Clear the module state. This is mainly for testing purposes.

def reset ():
    """ Clear the module state. This is mainly for testing purposes.
    """
    global __all_attributes, __all_features, __implicit_features, __composite_properties
    global __subfeature_from_value, __all_top_features, __free_features
    global __all_subfeatures

    # sets the default value of False for each valid attribute
    for attr in VALID_ATTRIBUTES:
        setattr(Feature, attr.replace("-", "_"), False)

    # A map containing all features. The key is the feature name.
    # The value is an instance of Feature class.
    __all_features = {}

    # All non-subfeatures.
    __all_top_features = []

    # Maps valus to the corresponding implicit feature
    __implicit_features = {}

    # A map containing all composite properties. The key is a Property instance,
    # and the value is a list of Property instances
    __composite_properties = {}

    # Maps a value to the corresponding subfeature name.
    __subfeature_from_value = {}

    # All free features
    __free_features = []

    __all_subfeatures = []