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The ZK User Interface Markup Language (ZUML) is based on XML. Each XML element describes what component to create. A XML attribute describes an initial values to be assigned to the created component. An XML processing instruction describes how to process the whole page, such as the page title.
 It was called http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul. However , many non-XUL features are added, so it is better to use an independent namespace.