code: def collection(name, child_names=None, child_source=None,
                 child_view=None, child_model=None, child_label=None,
                 child_desc=None, child_meta=None,
                 label=None, desc=None, meta=None, model_meta=None):
      
      _annotate("collection", name, child_names=child_names,
                child_source=child_source, child_view=child_view,
                child_model=child_model, child_label=child_label,
                child_desc=child_desc, child_meta=child_meta,
                label=label, desc=desc, meta=meta, model_meta=model_meta)
docs: Annotate a dynamic collection of sub-models.
  
      @param name:         name of the collection model containing the sub-models
      @type  name:         str or unicode
      @param child_names:  an effect that retrieve all sub-models names or
                           None if sub-models are not iterable.
      @type  child_names:  callable
      @param child_source: an effect that retrieve a sub-model source.
      @type  child_source: callable
      @param child_view:   an effect that retrieve a sub-model view.
      @type  child_view:   callable
      @param child_model:  the model identity, model factory or effect to get it,
                           or None to use IModel adapter.
      @type  child_model:  str or unicode or callable or IModelFactory or None
      @param child_label:  the model items label or None.
      @type  child_label:  str or unicode or None
      @param child_desc:   the model items description or None.
      @type  child_desc:   str or unicode or None
      @param child_meta:   collection model's items metadata.
      @type  child_meta:   list of tuple
      @param label:        the collection label or None.
      @type  label:        str or unicode or None
      @param desc:         the collection description or None.
      @type  desc:         str or unicode or None
      @param meta:         item metadata.
      @type  meta:         list of tuple
      @param model_meta:   collection model metadata.
      @type  model_meta:   list of tuple