def get_digest(self, id):
        digests = self._doc.xpath(
            ('//foxml:datastream['
             '@ID="%s"]/foxml:datastreamVersion/'
             'foxml:contentDigest[@TYPE="MD5"]/@DIGEST' + id),
            namespaces={'foxml':self._ns})
        if not digests:
            return
        return digests[-1].decode('utf8')
dataset/ETHPy150Open infrae/moai/moai/provider/fedora.py/FOXMLFile.get_digest/operator `%` -> `+`