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sShared support for scanning document type declarations in HTML and
XHTML.

Backported for python-future from Python 3.3. Reason: ParserBase is an
old-style class in the Python 2.7 source of markupbase.py, which I suspect
might be the cause of sporadic unit-test failures on travis-ci.org with
test_htmlparser.py.  The test failures look like this:

    ======================================================================

ERROR: test_attr_entity_replacement
(future.tests.test_htmlparser.AttributesStrictTestCase)

----------------------------------------------------------------------

Traceback (most recent call last):
  File
"/home/travis/build/edschofield/python-future/future/tests/test_htmlparser.py",
line 661, in test_attr_entity_replacement
    [("starttag", "a", [("b",
"&><"'")])])
  File
"/home/travis/build/edschofield/python-future/future/tests/test_htmlparser.py",
line 93, in _run_check
    collector = self.get_collector()
  File
"/home/travis/build/edschofield/python-future/future/tests/test_htmlparser.py",
line 617, in get_collector
    return EventCollector(strict=True)
  File
"/home/travis/build/edschofield/python-future/future/tests/test_htmlparser.py",
line 27, in __init__
    html.parser.HTMLParser.__init__(self, *args, **kw)
  File
"/home/travis/build/edschofield/python-future/future/backports/html/parser.py",
line 135, in __init__
    self.reset()
  File
"/home/travis/build/edschofield/python-future/future/backports/html/parser.py",
line 143, in reset
    _markupbase.ParserBase.reset(self)

TypeError: unbound method reset() must be called with ParserBase instance
as first argument (got EventCollector instance instead)

This module is used as a foundation for the html.parser module.  It has no
documented public API and should not be used directly.

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