[xml] Re: Apparent XPath bug in libxml 2.2.7

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From: David Moore (dmoore@its.caltech.edu)
Date: Sun Nov 12 2000 - 21:17:02 EST

The other day I sent a message regarding a bug in libxml's 2.2.7 xpath
support in regards to evaluating relative paths.

I think I've found the source of the bug. In 2.2.6, the following code
appeared in xmlXPathEval() just before xmlXPathEvalExpr() gets called:

    if (ctx->node != NULL) {
       init = xmlXPathNewNodeSet(ctx->node);
       valuePush(ctxt, init);
    }

In the case of relative paths, the user specifies a value for ctx->node
and thus it is not null. Without doing the above (as it is in 2.2.7 and
the current CVS), the CHECK_TYPE(XPATH_NODESET) assertion in
xmlXPathNodeCollectAndTest() will fail later on. I'm not sure if the
correct solution is simply to put back the above code, or replace the
functionality elsewhere, but I'm including a patch to just put back the
above code.

I hope this is helpful (relative path evaluation is very important to my
application).

Thanks.

Regards,

David

------------------------------------------------------
  David Moore California Institute of Technology
 <dcm@acm.org> http://www.ugcs.caltech.edu/~dmoore
------------------------------------------------------ 

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