List<OrionAttribute<String>> oaList2 = newArrayList(oa3, oa4);
oer2.getAttributes().addAll(oaList2);
OrionConnector op = new OrionConnector(
new OrionConnectorConfiguration());
ContextUpdateResponse resp = op.registerContextElements(oer1, oer2);
log.info("Response: {}", resp);
resp = op.deleteContextElements(oer1);