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Not necessarily: self.entityrefs is already updated in 
HTMLParser, so this should work for the base class.

One issue might be with encodings, e.g. if the document 
encoding is not Latin-1. In this case, one might not want to 
replace ä with its Latin-1 equivalent, so you might need 
to provide a hook where a subclass can chose not to perform 
entity expansion, or perform more of it (perhaps also with a 
possibility to perform character reference expansion).