public ExtensionFunctionHandler (String namespaceUri, String funcNames, String lang, String srcURL, String src)
public ExtensionFunctionHandler (String namespaceUri)
  public ExtensionFunctionHandler (String namespaceUri, String funcNames,                                    String lang, String srcURL, String src)   {    this (namespaceUri);    setFunctions (funcNames);    setScript (lang, srcURL, src);  }