$XX

    function $XX(xpath, context, resolver) {
        context || (context = document);
        var doc = context.ownerDocument || context;
        var result = doc.evaluate(xpath, context, resolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        result.__iterator__ = function() { for (let i = 0, len = this.snapshotLength; i < len; i++) yield this.snapshotItem(i); };
        return result
    }