def by_directory_definition_id(self,directory_definition_id: str) -> DirectoryDefinitionItemRequestBuilder:
        """
        Provides operations to manage the directories property of the microsoft.graph.synchronizationSchema entity.
        param directory_definition_id: The unique identifier of directoryDefinition
        Returns: DirectoryDefinitionItemRequestBuilder
        """
        if directory_definition_id is None:
            raise TypeError("directory_definition_id cannot be null.")
        from .item.directory_definition_item_request_builder import DirectoryDefinitionItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["directoryDefinition%2Did"] = directory_definition_id
        return DirectoryDefinitionItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the directories property of the microsoft.graph.synchronizationSchema entity.
        param directory_definition_id: The unique identifier of directoryDefinition
        Returns: DirectoryDefinitionItemRequestBuilder
        
msgraph/generated/applications/item/synchronization/jobs/item/schema/directories/directories_request_builder.py