code: def child(name, source=None, view=None, model=None,
            enabled=None, fetch=None, browse=None,
            label=None, desc=None, meta=None):
      
      _annotate("child", name, source=source, view=view, model=model,
                enabled=enabled, fetch=fetch, browse=browse,
                label=label, desc=desc, meta=meta)
docs: Annotate a sub-model to the one being defined.
      @param name: item name unique for the model being defined.
      @type name: str or unicode
      @param source: an effect to retrieve the sub-model source
                     or None to use the same source;
                     see feat.models.call for effect information.
      @type source: callable or None
      @param view: view value or an effect to retrieve it;
                   see feat.models.call for effect information.
      @type view: callable or object()
      @param model: the model identity, model factory or effect to get it,
                    or None to use IModel adapter.
      @type model: str or unicode or callable or IModelFactory or None
      @param enabled: an effect defining if the model is enabled
      @type enabled: bool or callable
      @param browse: an effect filtering the source when browsing to child.
      @type browse: callable
      @param fetch: an effect filtering the source when fetching child.
      @type fetch: callable
      @param label: the sub-model label or None.
      @type label: str or unicode or None
      @param desc: the description of the sub-model or None if not documented.
      @type desc: str or unicode or None
      @param meta: model item metadata atoms.
      @type meta: list of tuple