The ZK filter actually maps each HTML tag to the corresponding XHTML components. As described in the previous section, it consumes more memory than necessary since ZK has to maintain the states of all ZK components (including XUL and XHTML components).

ZK JSP tags are introduced to eliminate the need of the ZK filter for JSP pages. With ZK JSP tags, a ZUL component is created for each ZK JSP tag. All other HTML tags are encapsulated as a special component.

<!-- a JSP page -->
<z:page>
    <table>    
        <tr>        
            <td>Name</td>            
            <td><z:textbox/></td>            
        </tr>        
    </table>    
</z:page>

is equivalent to the following code snippet, if a ZUL page is used,

<!-- a ZUL page -->
<n:table xmlns:n="http://www.zkoss.org/2005/zk/native">
    <n:tr>    
        <n:td>Name</n:td>        
            <n:td><textbox/></n:td>            
    </n:tr>    
</n:table>