In the DArtbio case, we set up our heuristics, rather arbitrarily, to give headers to textblocks only; a more realistic decision-making process here can only be constructed after considerably more empirical investigation.
since the individual biography layout units are still complex, we do not immediately construct a header element but pass this option down so that it may be picked up by the first nuclear textblock that Partial layout structure following decomposition of the presentation plan according to summary and biographies.