Allow empty <sum> #5
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http://www.cril.univ-artois.fr/PB11/format.pdf defines <sum> as a non-empty sequence of <weightedterm>, but we relax the grammar to allow empty sequence as well. This is because we defined 'Sum' type as '[WeightedTerm]' instead of 'NonEmpty WeightedTerm' and it is possible to accidentally produce files that contain empty <sum>. We will consider preventing the generation of such files separately.
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http://www.cril.univ-artois.fr/PB11/format.pdf defines
<sum>as a non-empty sequence of<weightedterm>, but this PR relaxes the grammar to allow empty sequence as well.This is because we defined
Sumtype as[WeightedTerm]instead ofNonEmpty WeightedTermand it is possible to accidentally produce files that contain empty<sum>. We will consider preventing the generation of such files separately.Refs #4