127         self,

   127         self,

   128         deltas,

   128         deltas,

   129         linkmapper,

   129         linkmapper,

   130         transaction,

   130         transaction,

   131         addrevisioncb=None,

   131         addrevisioncb=None,

   132         maybemissingparents=False,

   133         maybemissingparents=False,

   133     ):

   134     ):

   134         raise NotImplementedError

   135         raise NotImplementedError

   135 

   136 

   136     def strip(self, minlink, transaction):

   137     def strip(self, minlink, transaction):