[XML-SIG] sax Attributes interface

[Alexandre Fayolle]

The Attributes interface is defined in xml.sax.saxlib.

The AttributesImpl implementation implicitely implements this interface,
and adds a new method, getNameByQName(self, name)

 1. shouldn't the implementation be made explicit, or is there a
performance hit?
 2. should the getNameByQName method be added to the Attributes interface,
or is there a backward compatibility concern with other implementations of
Attributes?

Alexandre Fayolle
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