Problem with xml.dom parser and xmlns attribute

P

Peter Maas

Hi,

I have a problem parsing html text with xmldom. The following code
runs well:

--------------------------------------------
from xml.dom.ext.reader import HtmlLib
from xml.dom.ext import PrettyPrint

r = HtmlLib.Reader()
doc = r.fromString(
'''
<html>
<head>
</head>
<body>
<p>hallo welt
</body>
</html>
''')
PrettyPrint(doc)
--------------------------------------------

but if I replace <html> by <html xmlns="http://www.w3.org/1999/xhtml">
I get the error

Traceback (most recent call last):
File "xhtml.py", line 5, in ?
doc = r.fromString(
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\HtmlLib.py", line 69, in fromString
return self.fromStream(stream, ownerDoc, charset)
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\HtmlLib.py", line 27, in fromStream
self.parser.parse(stream)
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\Sgmlop.py", line 57, in parse
self._parser.parse(stream.read())
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\Sgmlop.py", line 160, in finish_starttag
unicode(value, self._charset))
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\Element.py", line 177, in setAttributeNS
attr = self.ownerDocument.createAttributeNS(namespaceURI, qualifiedName)
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\Document.py", line 139, in createAttributeNS
raise NamespaceErr()
xml.dom.NamespaceErr: Invalid or illegal namespace operation
>Exit code: 1
Click to expand...

A lot of HTML documents on Internet have this xmlns=.... Are
they wrong or is this a PyXML bug?

Mit freundlichen Gruessen,

Peter Maas
 
R

Richard Brodie

Peter Maas said:
but if I replace <html> by <html xmlns="http://www.w3.org/1999/xhtml">
Click to expand...
A lot of HTML documents on Internet have this xmlns=.... Are
they wrong or is this a PyXML bug?
Click to expand...

If they are genuine XHTML documents, they should be well-formed XML,
so you should be able to use an XML rather than an SGML parser.

from xml.dom.ext.reader import Sax2
r = Sax2.Reader()
 
P

Peter Maas

Richard said:
but if I replace <html> by <html xmlns="http://www.w3.org/1999/xhtml"> [...]
A lot of HTML documents on Internet have this xmlns=.... Are
they wrong or is this a PyXML bug?
Click to expand...


If they are genuine XHTML documents, they should be well-formed XML,
so you should be able to use an XML rather than an SGML parser.

from xml.dom.ext.reader import Sax2
r = Sax2.Reader()
Click to expand...

Thanks, Richard. But in the Internet most of the time I don't know
what kind of document I'm dealing with when I start parsing. I guess
I should use HTMLParser (?).

Mit freundlichen Gruessen,

Peter Maas
 
R

Richard Brodie

Peter Maas said:
Thanks, Richard. But in the Internet most of the time I don't know
what kind of document I'm dealing with when I start parsing. I guess
I should use HTMLParser (?).
Click to expand...

If you're dealing with a wide range of web pages, chances are they
will have all manner of rubbish in them. I would probably feed the
stuff through Tidy (or uTidyLib) first, to convert to cleanish XHTML,
then use an XML parser.
 
U

Uche Ogbuji

Peter Maas said:
Hi,

I have a problem parsing html text with xmldom. The following code
runs well:

--------------------------------------------
from xml.dom.ext.reader import HtmlLib
from xml.dom.ext import PrettyPrint

r = HtmlLib.Reader()
doc = r.fromString(
'''
<html>
<head>
</head>
<body>
<p>hallo welt
</body>
</html>
''')
PrettyPrint(doc)
--------------------------------------------

but if I replace <html> by <html xmlns="http://www.w3.org/1999/xhtml">
I get the error

Traceback (most recent call last):
File "xhtml.py", line 5, in ?
doc = r.fromString(
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\HtmlLib.py", line 69, in fromString
return self.fromStream(stream, ownerDoc, charset)
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\HtmlLib.py", line 27, in fromStream
self.parser.parse(stream)
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\Sgmlop.py", line 57, in parse
self._parser.parse(stream.read())
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\ext\reader\Sgmlop.py", line 160, in finish_starttag
unicode(value, self._charset))
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\Element.py", line 177, in setAttributeNS
attr = self.ownerDocument.createAttributeNS(namespaceURI, qualifiedName)
File "C:\PROGRA~1\Python23\lib\site-packages\_xmlplus\dom\Document.py", line 139, in createAttributeNS
raise NamespaceErr()
xml.dom.NamespaceErr: Invalid or illegal namespace operation

A lot of HTML documents on Internet have this xmlns=.... Are
they wrong or is this a PyXML bug?
Click to expand...

This looks like a 4DOM bug. What are you hoping to do once you've
parsed these documents? If we know we can either suggest an
alternative tool to use or perhaps a workaround.

--Uche
 

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