Method returns true is the entity exists in the Repository,
        false, otherwise

        Args:
            uri(str): Entity URI

        Returns:
            bool

def exists(self, uri):
        """Method returns true is the entity exists in the Repository,
        false, otherwise

        Args:
            uri(str): Entity URI

        Returns:
            bool
        """
        ##entity_uri = "/".join([self.base_url, entity_id])
        try:
            urllib.request.urlopen(uri)
            return True
        except urllib.error.HTTPError:
            return False