public String getParameterString(){
			String retString = super.getParameterString();
			try{
				if(sourceText!=null) retString+="&sourceText="+sourceText;
				if(showSourceText!=null) retString+="&showSourceText="+(showSourceText?"1":"0");
				if(cQuery!=null) retString+="&cquery="+URLEncoder.encode(cQuery,"UTF-8");
				if(xPath!=null) retString+="&xpath="+URLEncoder.encode(xPath,"UTF-8");
				if(maxRetrieve!=null) retString+="&maxRetrieve="+maxRetrieve.toString();
				if(linkedData!=null) retString+="&linkedData="+(linkedData?"1":"0");
			}
			catch(UnsupportedEncodingException e ){
				retString = "";
			}
			return retString;
		}