There are issues with the doctype() method of XMLParser.
1. Using subclass of XMLParser emits a deprecation warning [1].
2. There is behavior difference between Python and C implementations if
implement doctype() [2].
This method was deprecated for long time, and the simplest solution is
to completely remove it. The questions are:
1. Can doctype() be removed or there is significant risk to break
someone's code?
2. If fix doctype() instead of removing it (in any case should be done
in maintained releases), what behavior should be preserved? Should
target's doctype() be called instead of XMLParser.doctype() (Python
implementation) or be called in addition to XMLParser.doctype() (C
implementation)?
Eli suggested to ask on Python-Dev.
[1] http://bugs.python.org/issue19176
[2] http://bugs.python.org/issue19176#msg238783
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