code: def get_storage(clear=False):
      
      portal = getUtility(ISiteRoot)
      annotations = IAnnotations(portal)
      if ANNOTATION_KEY not in annotations or clear:
          annotations[ANNOTATION_KEY] = OOBTree()
      return annotations[ANNOTATION_KEY]
docs: helper function to get annotation storage on the portal
  
      :param clear: If true is passed in, annotations will be cleared
      :returns: portal annotations
      :rtype: IAnnotations