def getService_urls(self, service_string=None):
urls=[]<EOL>for key,rec in six.iteritems(self.records):<EOL><INDENT>url = next((d['<STR_LIT:url>'] for d in rec.references if d['<STR_LIT>'] == service_string), None)<EOL>if url is not None:<EOL><INDENT>urls.append(url)<EOL><DEDENT><DEDENT>return urls<EOL>
Return easily identifiable URLs for all service types

Parameters
----------

- service_string: a URI to lookup