Possibility of doing span tournament on the source language

[frankier]

Something which dominates on the source side either in terms of simply being longer or actually outspanning should be a better support and therefore better annotation on the target side.

class SourceAnchorLengthDom(SpanKeyMixin, Tournament):
    @staticmethod
    def rank(ann):
        pass


class SourceAnchorSpanDom(SpanKeyMixin, Tournament):
    @staticmethod
    def rank(ann):
        pass