public String genKeywords(){
		if(keywords.size() > 0){
			StringBuffer impKeywords = new StringBuffer();
			Iterator<String> i = this.keywords.iterator();
			while(i.hasNext()) {
				impKeywords.append(i.next());
				if(i.hasNext()) impKeywords.append(",");
			}
			return impKeywords.toString();
		}
		return null;
	}