def remove_model_prefix(self, id):
        '''remove_model_prefix

        High-level api: If prefix is the model prefix, return tagname without
        prefix. If prefix is not the model prefix, simply return the identifier
        without modification.

        Parameters
        ----------

        id : `str`
            Identifier in `prefix:tagname` notation.

        Returns
        -------

        str
            Identifier in `prefix:tagname` notation if prefix is not the model
            prefix. Or identifier in `tagname` notation if prefix is the model
            prefix.
        '''

        reg_str = '^' + self.prefix + ':(.+)$'
        ret = re.search(reg_str, id)
        if ret:
            return ret.group(1)
        else:
            return id