Re: [xml] Support for Python

[Matt Sergeant <matt sergeant org>]

On Mon, 28 Jan 2002, Gary Benson wrote:

> On Mon, 28 Jan 2002, Dave Kuhlman wrote:
>
> > _But_, I worry about code like the following:
> >
> > > > > doc = p.xmlParseFile('test1.xml')
> > > > > root = doc.children
> > > > > doc = p.xmlParseFile('test1.xml')
> >
> > Now, root contains a reference to a Python object that contains a
> > reference to an underlying C object (a libxml node) that has gone
> > away.  Am I right about this?  If so it seems very dangerous.
> > xmlFreeDoc frees the nodes in the doc, too, doesn't it?
>
> Hmmm, if xmlNodes in doc.children have references to the parent (ie the
> xmlDoc) then this _should_ work -- the first doc won't be garbage
> collected because root.parent is referencing it. On the other hand, it
> might have created an undeletable object.

No, because root.parent is a C pointer, not a python one. So python would
see no reference to doc any more. That is unless you use proxy objects
like XML::LibXML.

-- 
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