New to protobuf but my google-fu is failing me here.  I would like to write 
a receiver that parses a base message, then distributes it to registered 
receivers who know how to parse the extensions. I don't want the receiver 
to know about the extensions, other than the range defined in the base 
.proto.  From reading the docs, you can define extensions to a message in 
separate .proto files.  But it seems like the receiver would need to know 
about all the extensions via an ExtensionRegistry.  This is to be used 
along with Netty - another user is dealing with a similar thing shown 

Is there a way around this?  A code example, ideally in Java?



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