Re: NSXML* classes

[Fred Kiefer]

On 26.02.2012 18:58, Ivan Vučica wrote:
> However, looks like an XPath query called on an NSXMLNode still doesn't
> return results as under OS X. That is, having called:
>
>    NSArray *opmlNodes = [self nodesForXPath:@"./opml" error:nil];
>    [self setOpmlRoot:[opmlNodes objectAtIndex:0]];
>
> with self being a subclass of NSXMLDocument, and thus getting the root
> node, the following call does not return the<body/>  subnode of the<opml/>
> root node, instead returning an array with zero entries:
>
>    bodyNodes = [_opmlRoot nodesForXPath:@"./body" error:nil];
>
> Looking at execute_xpath() in NSXMLNode.m, I must admit I have no idea what
> may be going wrong.
>
> If anyone wants to debug using my code, feel free to focus on the following
> files that actually deal with the data model:
> OPMLOutline.h
> OPMLOutline.m
> OPMLOutline+Private.h
> OPMLOutlineXMLElement.h
> OPMLOutlineXMLElement.m

I managed to reproduce and hopefully fix the XPath issue you are seeing. 
But there is a much deeper problem for your code. You rely on the fact 
to be able to replace the class of a node while parsing an XML document. 
This currently doesn't work with GNustep. I have a few ideas on how to 
fix this, but it will take some time.