code: func (dp *DescribedPermanode) IsContainer() bool {
  	if members := dp.Attr["camliMember"]; len(members) > 0 {
  		return true
  	}
  	for k := range dp.Attr {
  		if strings.HasPrefix(k, "camliPath:") {
  			return true
  		}
  	}
  	return false
  }
docs: // IsContainer returns whether the permanode has either named ("camliPath:"-prefixed) or unnamed
  // ("camliMember") member attributes.