[libxml2] Un seul parsing XPath par xmlDoc ?

Bonjour,

voici mon soucis :

j'utilise libxml2 et xpath en c++.
Dans ma phase d'init, je crée le xmlDocPtr et le xmlXPathContextPtr, puis j'appelle 2 fois la fonction qui évalue le xpath avec le xmlXPathContextPtr en parametre.
et bien le second résultat est tout le temps erroné !
En effet, la liste des éléments trouvés sont vides d'attributs et de children.

voici le code :

Code:

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#include <string.h>
#include <sstream>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <iostream>
 
 
using namespace std; 
 
void xpathParsing(xmlXPathContext xpathCtx){
	string Xpth("//");
	Xpth.append("*[contains(name(),'toto')]"); //the // allow to select all  descendants of the root node
	xmlXPathObjectPtr xpathObject; 
	xmlNodeSetPtr n;
	xmlNodePtr propsNode;
 
    xpathObject = xmlXPathEvalExpression((const xmlChar*)Xpth.data(), xpathCtx);
    if(xpathObject == NULL) {
		string err("Error: unable to evaluate xpath expression \n");
		throw (err);
    }
 
	if(!xmlXPathNodeSetIsEmpty(xpathObject->nodesetval)){
		n=xpathObject->nodesetval;
		for (int i=0; i < n->nodeNr; i++) {
			cout << n->nodeTab[i]->name << endl;
			if(n->nodeTab[i]->properties == NULL){
				cout << "NO PROPS" << endl;
			}else{
				for (propsNode = n->nodeTab[i]; propsNode->properties != NULL; propsNode->properties = n->nodeTab[i]->properties->next) {
					cout << "+" <<propsNode->properties->name << endl;
				}
			}
			if(n->nodeTab[i]->xmlChildrenNode == NULL){
				cout << "NO CHILD" << endl;
			}else{
				while (n->nodeTab[i]->xmlChildrenNode != NULL) {
					if((n->nodeTab[i]->xmlChildrenNode->type == XML_ELEMENT_NODE)){
						cout << "-" << n->nodeTab[i]->xmlChildrenNode->name << endl;
					}
					n->nodeTab[i]->xmlChildrenNode = n->nodeTab[i]->xmlChildrenNode->next;
				}
			}
		}
	}else{
		cout << "empty" << endl;
	}
 
	xmlXPathFreeObject(xpathObject);
}
 
int main(int argc, char **argv) {
 
	xmlDocPtr doc;
	xmlXPathContext xpathCtx;
 
 
	xmlInitParser();
	xmlXPathInit();			
	xmlKeepBlanksDefault(0);
	doc = xmlReadFile("TestFESA210.xml",NULL, 0);
	if (doc == NULL) {
		string err("Invalid XML document\n");
		throw (err);
	}
	xpathCtx = xmlXPathNewContext(doc);
	if(xpathCtx == NULL) {
		string err("Error: unable to create new XPath context\n");
		throw (err);
	}
 
	cout << "PREMIER XPATH" << endl;
        xpathParsing(xpathCtx);
 
	cout << endl << "SECOND XPATH" << endl;
	xpathParsing(xpathCtx);
 
	xmlXPathFreeContext(xpathCtx); 
	xmlFreeDoc(doc); 
	xmlCleanupParser();
	xmlMemoryDump();
 
	return (1);
}

merci d'avance.