AtomEntryEntityProducer as = new AtomEntryEntityProducer(properties);
EntityInfoAggregator eia = EntityInfoAggregator.create(entitySet, properties.getExpandSelectTree());
as.append(writer, eia, data, true, false);
writer.flush();
csb.closeWrite();
ODataResponseBuilder response = ODataResponse.entity(csb.getInputStream())
.eTag(as.getETag())
.idLiteral(as.getLocation());
return response.build();