def _is_valid_collection_json(self, json_repr):
        """Call the primary validator for a quick test"""
        collection = self._coerce_json_to_collection(json_repr)
        if collection is None:
            # invalid JSON, definitely broken
            return False
        aa = validate_collection(collection)
        errors = aa[0]
        for e in errors:
            _LOG.debug('> invalid JSON: {m}'.format(m=e.encode('utf-8')))
        if len(errors) > 0:
            return False
        return True
Call the primary validator for a quick test