* Macro components are supported; developing new components without programming.
* Developers are allowed to define new components in a page.
* Two new components: imagemap and area.
* The custom-attributes element is added to simplify the assignment of custom attributes.
* The regular expression constraints are supported.
* Components could be created in any thread, not limited event listeners.
* ZK Update Engine is optimized for pages with a lot of components.
* ZK is configurable by use of /WEB-INF/zk.xml.
* More configuration options are supported.