def item_guid(self, version):
        url = absolutify(reverse('addons.versions', args=[version.addon_id]))
        return "%s#version-%s" % (url, version.version)
Guid for a particuar version  (<item><guid>)
dataset/ETHPy150Open mozilla/addons-server/src/olympia/versions/feeds.py/VersionsRss.item_guid