koalaGMLXML语法的界面框架
koalaGML用类似于jsp的xml语法来允许开发人员从XML文档（这一文档定义了界面布局与内容）中快速生成功能丰富的图形用户界面。
实现上面这个界面的代码是：
<!--
Document : combobox2.xml
Created on : October 28, 2002, 9:56 AM
Author : Ricardo Zuasti
Description:
Combobox usage example II.
-->
<form language="java" width="230" height="200" locationx="0" locationy="0" resizable="yes">
<head>
<title>
koaLaGML comboBox example
</title>
</head>
<body>
<space height="10" />
<combobox id="combo1" selected="2" width="150" height="25" enable="yes">
<option value="1" caption="bird" />
<option value="2" caption="pig" />
</combobox>
<space height="10" />
<inputtext id="txtCaption" width="150" height="25" text="caption" enable="yes" />
<inputtext id="txtValue" width="150" height="25" text="value" enable="yes" />
<space height="10" />
<button caption="add" enable="yes" fork="no">
<scriptlet type="onclick" language="java">
form.getComboBox("combo1").addItem(
form.getInputText("txtCaption").getText(),
form.getInputText("txtValue").getText());
</scriptlet>
</button>
<space height="10" />
<button caption="show" enable="yes" fork="no">
<scriptlet type="onclick" language="java">
form.getLabel("label1").setCaption(
form.getComboBox("combo1").getCaption() + " - " +
form.getComboBox("combo1").getValue());
</scriptlet>
</button>
<space height="10" />
<label id="label1" caption="make a choice and enjoy it" />
<space height="10" />
</body>
</form>