Hello Michael!
Or are you talking about the result document written by the transformation? In that case in general, the result document is serialized as it is created. But of course there may be cases where the creation of the result tree is the last thing the transformation does.
Yes I mean the result document of the transformer. I talk about a debugging of the transformation and I want to have the results so far if I stop at a point in the transformation. The full output will be written at the end of the transformation, only.

If I do such things with Xalan for example, the output until the breakpoint is written out but I need to set

    factory.setAttribute(org.apache.xalan.processor.TransformerFactoryImpl.FEATURE_INCREMENTAL, Boolean.TRUE);

So I had the idea that there could be such option in Saxon, too!?

best regards, marc pellmann