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The xmllib.XMLParser seems to be unable to parse 
an XML file that contains cyrillic characters.
 File "xmllib.pyc", line 172, in feed
 File "xmllib.pyc", line 268, in goahead
 File "xmllib.pyc", line 798, in syntax_error
 Error: Syntax error at line 8: illegal character in content

Could you please provide minimal reproducer? Minimal script and minimal data that expose the issue.

I have attached xmllib.py. This file is in python23\lib folder.
The strings in XML file are in cyrillic language.
My code:
import xmllib
class Parser(xmllib.XMLParser):
 # a simple styling engine
 def __init__(self):
 xmllib.XMLParser.__init__(self)
 self.cursupervisore = None
 self.curdata = ''
 self.elements = {'Superv':(self.starttag_superv, self.endtag_superv)
........
 }
 def load(self, file):
 while 1:
 s = file.readline()
 if not s:
 break
 self.feed(s)
 self.close()
def read_plant_tree(filexml):
 c = Parser()
 c.load(filexml)

See also issue222587. Seems this was the reason why the xmllib module was deprecated.
Use the xml package for parsing XML (xml.etree.ElementTree, xml.dom.minidom, xml.sax, etc).