#include "libxml/parser.h"
#include "libxml/tree.h"
#include "libxml/xpath.h"

void noproblem(const char* xml, const xmlChar* xpath)
{
	xmlDocPtr doc = xmlReadMemory(xml, strlen(xml), 0, 0, 0);
	if (doc)
	{
		xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
		if (xpathCtx)
		{
			xmlXPathObjectPtr xpathObj = xmlXPathEvalExpression(xpath, xpathCtx);
			if (xpathObj)
			{
				xmlBufferPtr buf = xmlBufferCreate();
				if (buf)
				{
					xmlNodeSetPtr nodes = xpathObj->nodesetval; // could not be nodeset but hey
					int i, l = nodes ? nodes->nodeNr : 0;
					for (i = 0; i < l; ++i)
					{
						xmlNodeDump(buf, doc, nodes->nodeTab[i], 0, 0); // can error
						xmlBufferCat(buf, "\n");
					}
					printf(xmlBufferContent(buf));
					xmlBufferFree(buf);
				}
				xmlXPathFreeObject(xpathObj);
			}
			xmlXPathFreeContext(xpathCtx); 
		}
		xmlFreeDoc(doc);
	}
}

int main()
{
	xmlInitParser();
	noproblem("<a:a xmlns:a='urn:whatevar'/>", "//namespace::*");
	xmlCleanupParser();
}