rem: var obj = Components.classes.nsEcho.createInstance(); obj = obj.QueryInterface(Components.interfaces.nsIEcho); return obj; 
add: var clazz = Components.classes["@mozilla.org/js/xpc/test/Echo;1"]; var iface = Components.interfaces.nsIEcho; return new clazz(iface); 
context: function nsNativeEcho(){    var obj = Components.classes.nsEcho.createInstance();    obj = obj.QueryInterface(Components.interfaces.nsIEcho);    return obj;}    
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/d50e6f9d653bd2ce65721c955cd37ec4a694bba8/xpctest_callcontext.js/clean/js/src/xpconnect/tests/js/old/xpctest_callcontext.js