docs: def register_rml_def(self,
                           location_type,
                           location,
                           filename=None,
                           **kwargs):
          """
          Registers the rml file locations for easy access
  
          Args:
          -----
              location_type: ['package_all',
                              'package_file',
                              'directory',
                              'filepath']
              location: The correlated location string based on the location_type
              filename: Optional, associated with 'package_file' location_type
  
          kwargs:
          -------
              include_subfolders: Boolean
          """
          if location_type == 'directory':
              self.register_directory(location, **kwargs)
          elif location_type == 'filepath':
              if not os.path.exists(location):
                  raise OSError("File not found", location)
              if os.path.isfile(location):
                  self.register_rml(location)
              elif filename:
                  new_loc = os.path.join(location, filename)
                  if not os.path.exists(new_loc):
                      raise OSError("File not found", new_loc)
                  elif os.path.isfile(new_loc):
                      self.register_rml(new_loc)
              else:
                  raise OSError("File not found", location)
          elif location_type.startswith('package'):
              pkg_path = \
                      importlib.util.find_spec(\
                              location).submodule_search_locations[0]
              if location_type.endswith('_all'):
                  self.register_directory(pkg_path, **kwargs)
              elif location_type.endswith('_file'):
                  filepath = os.path.join(pkg_path, filename)
                  self.register_rml(filepath, **kwargs)
              else:
                  raise NotImplementedError