context:   preTransform : function ()   {    try {      this.mStyle  = document.implementation.createDocument("", "", null);      this.mAction = DO_TRANSFORM;      this.mStyle.addEventListener("load", this, false);      var sheet = null;      var ns = this.getDocument().documentElement.namespaceURI;          if (ns == "http://www.w3.org/2002/01/P3Pv1") {        sheet = STYLESHEET_URL_200201;      } else if (ns == "http://www.w3.org/2001/09/P3Pv1") {        sheet = STYLESHEET_URL_200109;      } else if (ns == "http://www.w3.org/2000/12/P3Pv1") {        sheet = STYLESHEET_URL_200012;      } else if (ns == "http://www.w3.org/2000/10/18/P3Pv1") {        sheet = STYLESHEET_URL_200010;      } else if (ns == "http://www.w3.org/2000/P3Pv1") {        sheet = STYLESHEET_URL_200005;      } else {        this.reportError(SUMMARY_ERROR);      }      if (sheet) {        this.mStyle.load(sheet);      }    }    catch(ex) {      this.reportError(LOAD_SUMMARY);    }  },
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