def iter_descendants(self, ontology, iri, size=None, sleep=None):
url = self.ontology_term_descendants_fmt.format(ontology=ontology, iri=iri)<EOL>log.info('<STR_LIT>', url)<EOL>for term in self._iter_terms_helper(url, size=size, sleep=sleep):<EOL><INDENT>yield term<EOL><DEDENT>
Iterates over the descendants of a given term

        :param str ontology: The name of the ontology
        :param str iri: The IRI of a term
        :param int size: The size of each page. Defaults to 500, which is the maximum allowed by the EBI.
        :param int sleep: The amount of time to sleep between pages. Defaults to 0 seconds.
        :rtype: iter[dict]