[xml] Using Xpath from a node

[Raymond Wiker <Raymond Wiker fast no>]

Israel Ganor writes:
> Hi,
>
> I've just starting using libxml2.
> I wonder if there is a way to the the context of an element using a relative
> Xpath expression. E.g., soppose my xmlNodePtr points to the last B element
> (see below). Now I want to directly read the text of subelement E, without
> looping through all B's subelements. Is this possible? The only way I found
> so far is to build the full Xpath of E (from the doc's root) and get it
> using the full expression, but this looks like an non-elegant and
> inefficient.

        I *think* you can set the "node" element in the
xmlXPathContext object to point to the node you want to start from.
E.g, something like 

    xmlXPathContextPtr xpathCtxt;
    xmlXPathObjectPtr xpathObj;

    xpathCtxt = xmlXPathNewContext(doc_);
    xpathCtxt->node = node_;
    xpathObj = xmlXPathEvalExpression((const xmlChar *) selectstr_, 
                                      xpathCtxt);

    ...

        I may be wrong on this, but it is my current working
assumption :-)

-- 
Raymond Wiker                        Mail:  Raymond Wiker fast no
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