How do people feel about modifying the typesystem? I'm finding that
grabbing the dependency headword is something very useful for feature
extraction. But it is a bottleneck if every feature extractor that uses
it has to recompute it. So I propose adding a field to the
IdentifiedAnnotation type of "headNode" with type ConllDependencyNode.

Any thoughts or good reasons to avoid this?

Thanks
Tim

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