property nodeType

    var factory = shell.serviceManager.maxiXML.factory;
    var dom = factory.createDOMDocumentFromPath("c:\\document.xml", false);
    var rootElement = dom.documentElement;
    var child = element.firstChild;
    var sibling = child.nextSibling;
        
    if(sibling.nodeType == "element")
    {
        sibling.getElementsByTagName("b");
    }