def get_identities(self, item):
        """ Return the identities from an item """

        if 'authorData' in item['data']['fields']:
            user = self.get_sh_identity(item['data']['fields']['authorData'])
            yield user

        if 'ownerData' in item['data']['fields']:
            user = self.get_sh_identity(item['data']['fields']['ownerData'])
            yield user
Return the identities from an item