RequestNode source = connection.getSource();
Location sourceLocation = (Location)source.getAnnotation(AnnotationKeys.LOCATION);
ds.setService(sourceLocation);
Serialiser serialiser = new GenericSerialiser();
ds.setSerialiser(serialiser);
TraversableSingleActivityOutput serOut = serialiser.applySerialiser(
sourcePipeline,
sourcePE.getOutput(
connection.getSourceOutputName(),
connection.getSourceOutputIndex()));