[xml] XPath context


Would someone mind explaining to me what effect setting
the node member in a xmlXPathContext structure has on
an X Path evaluation.

for example,

ctxt = xmlXPathNewContextPtr(doc);
ctxt->node = xmlDocGetRootElement(doc);

result = xmlXPathEval( BAD_CAST"/book/chapter[1]/descendant::*", ctxt");

Thanks for any hints,


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