class MigrateProcessPlugin

class MigrateProcessPlugin extends Plugin {
    
    /**
     * A unique identifier for the process plugin.
     *
     * @var string
     */
    public $id;
    
    /**
     * Whether the plugin handles multiples itself.
     *
     * This property is optional and it does not need to be declared.
     *
     * Typically these plugins will expect an array as input and iterate over it
     * themselves, changing the whole array. For example the 'sub_process' and the
     * 'flatten' plugins. If the plugin only need to change a single value it
     * can skip setting this attribute and let
     * \Drupal\migrate\MigrateExecutable::processRow() handle the iteration.
     *
     * @var bool
     */
    public $handle_multiples = FALSE;

}