xmlDocPtr xmlDoc;
xmlXPathContextPtr xpathCtx; 
xmlXPathObjectPtr xpathObj; 
xmlNodePtr node;
xmlChar *attr;
int i;

xmlDoc = xmlParseFile(fileName);
xpathCtx = xmlXPathNewContext(xmlDoc);

xpathObj = xmlXPathEval("/header", xpathCtx);
if((!xpathObj) || (xpathObj->nodesetval->nodeNr== 0 )) {
	reasonForFailure = "node /header not found";
	return;
}
// Для кажого <header> найденого в корне документа:
for (i= 0 ; i<xpathObj->nodesetval->nodeNr; i++) {
	node = xpathObj->nodesetval->nodeTab[ i ];
	if(attr = xmlGetProp(node, "action")) {
		printf("action = %s in header %d\n", attr, i);
	}
}
xmlXPathFreeObject(xpathObj);

xpathObj = xmlXPathEval("/account", xpathCtx);
// Для кажого <account> найденого в корне документа:
for (i= 0 ; i<xpathObj->nodesetval->nodeNr; i++) {
	node = xpathObj->nodesetval->nodeTab[ i ];
	if(attr = xmlGetProp(node, "service")) {
		printf("service = %s in account %d\n", attr, i);
	}
}
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
xmlFreeDoc(xmlDoc);