The CoreMap key for getting the binarized version of the
syntactic parse tree of a sentence.
This key is typically set on sentence annotations. It is only
set if the parser annotator was specifically set to parse with
this (parse.saveBinarized). The sentiment annotator requires
this kind of tree, but otherwise it is not typically used.
Returns the type associated with this annotation. This method must
return the same class type as its value type parameter. It feels like
one should be able to get away without this method, but because Java
erases the generic type signature, that info disappears at runtime.