<window title="Hello" border="normal"> Hello World! </window>
Then, browse to the right URL, say http://localhost/myapp/hello.zul, and you got it.
In a ZUML page, a XML element describes what component to create. In this example, it is a window (org.zkoss.zul.Window). The XML attributes are used to assign values to properties of the window component. In this example, it creates a window with a title and border, which is done by setting the title and border properties to "Hello" and "normal", respectively.
The text enclosed in the XML elements is also interpreted as a special component called label (org.zkoss.zul.Label). Thus, the above example is equivalent to the following.
<window title="Hello" border="normal"> <label value="Hello World!"/> </window>
Also, it is equivalent to
<window title="Hello" border="normal"> <label>Hello World!"</label> </window>