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This section describes what a language definition and addon are. It is required for the component component. However, you could skip it if you won't develop components. For more information about component development, please refer to ZK Component Development Essentials.

If you would like to change the default configuration of an ZK application, please refer to ZK Developer's Reference: Packing Code.

A language definition defines a component set (aka., a language). For example, ZUL and XHTML are two component sets.

To define a language definition, you have to prepare a file called /metainfo/zk/lang.xml and makes it available to the classpath (such as in a JAR file, or in WEB-INF/classes of a Web application). In addition, you could specify them in /metainfo/zk/config.xml in the classpath.

A language addon is used to extend a language definition. It should be called /metainfo/zk/lang-addon.xml available to the classpath, specified in WEB-INF/zk.xml (in a Web application), or specified in /metainfo/zk/config.xml (in a JAR file; classpath).

When ZK starts, it will parse all language definitions and then all language addons based on their dependency. A language addon is a variant of a language definition. They are almost the same, except the naming and it must specify the addon name.

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