public String getParameterString(){
		String retString = super.getParameterString();
		try{
			if(sourceText!=null) retString+="&sourceText="+sourceText;
			if(cQuery!=null) retString+="&cquery="+URLEncoder.encode(cQuery,"UTF-8");
			if(xPath!=null) retString+="&xpath="+URLEncoder.encode(xPath,"UTF-8");
			if(baseUrl!=null) retString+="&baseUrl="+URLEncoder.encode(baseUrl,"UTF-8");
		}
		catch(UnsupportedEncodingException e ){
			retString = "";
		}
		return retString;
	}