SafeHtmlBuilder helpTexts = new SafeHtmlBuilder();
helpTexts.appendHtmlConstant("<table class='help-attribute-descriptions'>");
// The form
form = new ModelNodeForm();
List<FormItem> items = new ArrayList<FormItem>();
// each add operation requires an artificial parameter 'entity.key'
if("add".equals(operationmetaData.get("operation-name").asString()))
items.add(new TextBoxItem("entity.key", "Name", true));