xces and xces-disamb implicitly assume different lemma selection strategy

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What steps will reproduce the problem?

echo "Mają kręgi." > seg.txt
~/pantera/bin/pantera -t nkjp --engine 
~/pantera/engines/ultimarum-tertia-np0-6.btengine seg.txt -o xces-disamb
mv seg.txt.disamb seg.xces
~/pantera/bin/pantera -t nkjp --engine 
~/pantera/engines/ultimarum-tertia-np0-6.btengine seg.txt -o xces
mv seg.txt.disamb seg.xces-sh

The standard XCES output (-o xces-disamb) implicitly assumes that only one 
(lemma,tag) pair is selected. The selection seems arbitrary.

The “sh” XCES dialect preserves both lemmata when having the same tag.

Is this really intended?

Original issue reported on code.google.com by [email protected] on 20 Feb 2012 at 2:52