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Parse XHTML5 with undefined objects

Please note the following:

import xml.etree.ElementTree as ET

xhtml = '''<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
        <html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
        <head><title>XHTML sample</title></head>
            <body>
                <p>&nbsp;Sample text</p>
            </body>
        </html>
'''
parser = ET.XMLParser()
parser.entity['nbsp'] = '&#x00A0;'
tree = ET.fromstring(xhtml, parser=parser)
print(ET.tostring(tree, method='xml'))

which displays a nice textual representation of the string xhtml.

But for the same XHTML document with an HTML5 document:

xhtml = '''<!DOCTYPE html>
        <html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
        <head><title>XHTML sample</title></head>
            <body>
                <p>&nbsp;Sample text</p>
            </body>
        </html>
'''

I get an exception:

xml.etree.ElementTree.ParseError: undefined entity: line 5, column 19

therefore, the analyzer cannot handle this, although I added nbspa dict to the entities.

The same thing happens if I use lxml:

from lxml import etree
parser = etree.XMLParser(resolve_entities=False)
tree = etree.fromstring(xhtml, parser=parser)
print etree.tostring(tree, method='xml')

arises:

lxml.etree.XMLSyntaxError: Entity 'nbsp' not defined, line 5, column 26

although I installed a parser to ignore entities.

Why is this and how is it possible to parse XHTML files with HTML5 doctype declaration?

A partial solution for lxml is to use the utility:

parser = etree.XMLParser(resolve_entities=False, recover=True)

but I'm still waiting for the best.

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, Expat parser, , - , xml.etree.ElementTree, , . UseForeignDTD, , Expat doctype xml.etree.ElementTree. :

import xml.etree.ElementTree as ET

xhtml = '''<!DOCTYPE html>
        <html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
        <head><title>XHTML sample</title></head>
            <body>
                <p>&nbsp;Sample text</p>
            </body>
        </html>
'''
parser = ET.XMLParser()
parser._parser.UseForeignDTD(True)
parser.entity['nbsp'] = u'\u00A0'
tree = ET.fromstring(xhtml, parser=parser)
print(ET.tostring(tree, method='xml'))

: , doctype . , all, , doctype.

, , ElementTree.XMLParser.entity, , , - . &nbsp; u'\u00A0'.

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