rem: return this.ds.Change (n1, a, oldN2, n2); 
add: if (!n1 || !a || !n2) dd(getStackTrace()); 
context: function rdf_duassert (n1, a, n2){    var oldN2 = this.ds.GetTarget (n1, a, true);    if (!oldN2)    {        dd ("** Unable to change " + n1.Value + " -[" + a.Value + "]->, " +            "because old value was not found.");        return null;    }        return this.ds.Change (n1, a, oldN2, n2);    }
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/b81f0fbe3d57f0ce395d7a45312b71356c750f42/rdf.js/buggy/extensions/irc/xul/content/rdf.js