Reads through the class defs and gets the related es class
    defintions

    Args:
    -----
        class_defs: RdfDataset of class definitions

def es_get_class_defs(cls_def, cls_name):
    """
    Reads through the class defs and gets the related es class
    defintions

    Args:
    -----
        class_defs: RdfDataset of class definitions
    """
    rtn_dict = {key: value for key, value in cls_def.items() \
                if key.startswith("kds_es")}
    for key in rtn_dict:
        del cls_def[key]
    return rtn_dict