Request.XML = new Class({

    Extends: Request,
    
    success: function(text, xml){
        if (!Browser.Engine.trident) {
            xml.selectNodes = function(xpath){
                var nodes = [];
                var result = this.evaluate(xpath, this, this.createNSResolver(xml.documentElement), XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
                if (result) {
                    var node = result.iterateNext();
                    while (node) {
                        nodes.push(node);
                        node = result.iterateNext();
                    }
                }
                return nodes;
            }
            xml.selectSingleNode = function(xpath){
                var result = this.evaluate(xpath, this, this.createNSResolver(this.documentElement), 9, null);
                if (result && result.singleNodeValue) 
                    return result.singleNodeValue;
                else 
                    return [];
            }
        }
        else {
            // ie
            xml = {
                documentElement: this.createXML(xml.documentElement)
            };
        }
        
        this.onSuccess(xml, text);
    },
    
    createXML: function(xml, parent){
        if (!parent) 
            parent = new Element(xml.nodeName);
        
        var tmp;
        for (var j = 0; j < xml.attributes.length; j++) {
            tmp = xml.attributes[j];
            parent.setProperty(tmp.nodeName, tmp.nodeValue);
        }
        
        if (!xml.childNodes.length) 
            return parent;
        
        var i, j, currChildNode;
        for (i = 0; i < xml.childNodes.length; i++) {
            currChildNode = xml.childNodes[i];
            
            if (currChildNode.nodeType == 1) { // Element type
                // NodeName
                var el = new Element(currChildNode.nodeName);
                
                // Attributes
                if (currChildNode.attributes.length) {
                    for (j = 0; j < currChildNode.attributes.length; j++) {
                        tmp = currChildNode.attributes[j];
                        el.setProperty(tmp.nodeName, tmp.nodeValue);
                    }
                }
                
                // Value
                el.set({
                    'text': currChildNode.firstChild.nodeValue
                });
                
                parent.adopt(el);
                
                if (currChildNode.childNodes.length) 
                    this.createXML(currChildNode, el);
            }
        }
        
        return parent;
    }
    
});