Re: [xml] What would make xmlSetProp return null?

[Bjoern Hoehrmann <derhoermi gmx net>]

* Marco Rogers wrote:
> I have two versions of my codebase with pretty minimal changes.  Here's the
> call to xmlSetProp
>
>     xmlAttr *elem = xmlSetProp(element->xml_obj,
>                                               (const xmlChar*)*name,
>                                               (const xmlChar*)*value);
>
> The var element->xml_obj is a xmlNodePtr.
>
> In the old version of the code this produced a valid attribute.  In the new
> version it doesn't.  This is part of a non-trivial codebase that is
> integrated with google v8 so provided more context is difficult.  I've
> checked all of the values and they seem valid.  But elem always ends up
> being null.  Any idea where/how I should start to debug?

My guess would be you do not have an element node, but rather some other
node type. A quick look at the source suggests you get NULL in that case
or if the node or the name is NULL, or some rather involved conditions
(see `xmlGetPropNodeInternal`).
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