code: def add(self, name, definition):
          
          self._storage[name] = self._expand_definition(definition)
docs: Register a definition to the registry. Existing definitions are
          replaced silently.
  
          :param name: The name which can be used as reference in a validation
                       schema.
          :type name: :class:`str`
          :param definition: The definition.
          :type definition: any :term:`mapping`