Date: 27 January 2007 11:00:18 GMT
Subject: Re: [xml] issue with libxml2, python and entities
On Sat, Jan 27, 2007 at 12:34:21AM +0000, Mike Kneller wrote:
I am not sure if I have located a bug or not....
Using Python (2.4) and libxml2.2.6.22
When I load an document containing an entity, if I attempt to read
the value of a node containing an entity, I get the text content and
the entity disappears.
In the following example, when looking at root.content I would expect
to see '©2007', instead all I get is '2007'.
I was advised on the #XML IRC channel to construct a simple test
case, so here it is:
On IRC you said the entity was defined in the internal subset, it's not
File 1: test.xml
<?xml version="1.0"?>
<!DOCTYPE content [
<!ENTITY % HTMLlat1 PUBLIC
"-//W3C//ENTITIES Latin 1 for XHTML//EN"
%HTMLlat1;
]>
<content>
</content>
libxml2 doesn't load externl subset by default,
File 2: testcase.py
import libxml2
sourcedoc = libxml2.parseFile( 'test.xml' )
root = sourcedoc.getRootElement()
print root.serialize()
print root.content
So your content element has 2 children an entity reference
to copy whose content is unknown and the text node with "2007"
Reading the source for libxml2.py, I find the following:
def getContent(self):
"""Read the value of a node, this can be either the text
carried directly by this node if it's a TEXT node or the
aggregate string of the values carried by this node
child's (TEXT and ENTITY_REF). Entity references are
substituted. """
ret = libxml2mod.xmlNodeGetContent(self._o)
return ret
Which in my (admittedly limited) understanding I would have thought
would return the translated entity as well as the text when I examine
root.content.
Is this a bug, or am I doing something wrong?
Not askling to load the external subset, use readFile and pass the
XML_PARSE_DTDLOAD option. It should work even with the ancient version
2.6.22 , but please firtst upgrade first in case of problem.
Daniel
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