def pick_signed_metadata_statements(self, fo, context):
sms_dict = self.signer.metadata_statements[context]<EOL>res = []<EOL>for iss, vals in sms_dict.items():<EOL><INDENT>if iss == fo:<EOL><INDENT>res.extend((iss, vals))<EOL><DEDENT><DEDENT>return res<EOL>
Pick signed metadata statements based on ISS pattern matching

:param fo: Federation operators ID
:param context: In connect with which operation (one of the values in 
    :py:data:`fedoidc.CONTEXTS`). 
:return: list of tuples (FO ID, signed metadata statement)