Annotation

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 Name: annotation
 Namespace: http://www.zkoss.org/2005/zk/annotation
 Namespace shortcut: client
 Java: <javadoc method="ANNOTATION_NAMESPACE">org.zkoss.zk.ui.metainfo.LanguageDefinition</javadoc>

It is the reserved namespace for specifying the annotation. By default, the annotation is recognized by its syntax, <code>@''name''(''arguments'')</code>, so you generally don't have to specify the annotation namespace. For example, the following two statement are equivalent:

<source lang="xml">
<textbox value="@bind(vm.p1.firstName)"/> <!-- implies the annotation name space -->
<textbox a:value="@bind(vm.p1.firstName)" xmlns:a="annotation"/> <!-- equivalent to the above -->
</source>

If you have to specify both the value and annotation of a property, the annotation namespace is useful. For example,

<source lang="xml">
<textbox value="abc" a:value="@annot()" xmlns:a="annotation"/>
</source>

On the other hand, if a value looks like an annotation and you don't want it to be interpreted as an annotation, you could specify the component's namespace, such as <code>zul</code>. For example,

<source lang="xml">
<textbox z:value="@thisIsValueNotAnnot()" xmlns:z="zul"/>
</source>

For the syntax of annotations, please refer to [[ZK Developer's Reference/Annotations|ZK Developer's Reference: Annotations]].
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