def METHOD_NAME(self):
    """Checks if the tag conforms to the `eTag spec <http:
    //devicehub.ereuse.org/tags.html#etags>`_.
    """
    with suppress(ValueError):
        provider, id = self.id.split('-')
        if len(provider) == 2 and 5 <= len(id) <= 10:
            return True
    return False