robertwb commented on pull request #13431:
URL: https://github.com/apache/beam/pull/13431#issuecomment-735986540


   I've updated the documentation. 
   
   Java provides meaning to these specific methods by using annotations, but I 
still think we want a type in Python (unless we wanted to make *all* DoFns into 
RestrictionProviders and WatermarkEstimatorProviders, with their corresponding 
default methods). Not being able to bind these things based on DoFn properties 
is very constraining though (as you discovered as well). 


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