This is thedailywtf material:

To write an xml file in tag order, autoxml implementation reads the .py source files,
parses them, puts the source code order to a list by looking at the written line orders
of the members.

This perfect implementation blows reload logic.

Seen when a new class (class Obsolete) added.

pisi/pxml/autoxml.py

@@ -268,8 +268,12 @@ class autoxml(oo.autosuper, oo.autoprop):
         errorss = []
         formatters = []
 
+        # FIXME: What is this? Remove this crap and try to fix autoxml, if can not be fixed then 
+        # really throw whole autoxml to junk. But not this.
+
         # read declaration order from source
         # code contributed by bahadir kandemir
+        try:
             from inspect import getsourcelines
             from itertools import ifilter
             import re
@@ -278,6 +282,8 @@ class autoxml(oo.autosuper, oo.autoprop):
 
             lines = filter(fn, getsourcelines(cls)[0])
             decl_order = map(lambda x:x.split()[0], lines)
+        except IOError:
+            decl_order = dict.keys()
 
         # there should be at most one str member, and it should be
         # the first to process