groovy-core/src/test/org/codehaus/groovy/tools/xml/swing.xml

<?xml version="1.0"?>
<!-- this example demonstrates using markup to specify a rich user interface -->
<frame text="My Window" size="[300,300]">
    <label text="Save changes" bounds="[10,10,290,30]"/>
    <panel bounds="[10,40,290,290]">
        <button text="OK" action="save()"/>
        <button text="Cancel" action="close()"/>
    </panel>
</frame>