<variables [local="false|true] var1="value1" [var2="value2"...]/>
It defines a set of variables for the ID space it belongs. It is equivalent to the setVariable method of Component, if it has a parent component, and Page, if it is declared at the page level.
You could specify as many as variables you want. These variables are stored to the namespace of the ID space it belongs. Thus, they can be accessible by the interpreters and EL expressions.
<variables cd="${param.cd}" less="more"/>
[optional][Default: false]
Specifies whether to store the variable always at the current ID space. By default, it is false. It means ZK will check the existence of any variable with the same name by looking up the current ID space, the parent ID space, and parent's parent, and so on. If found, the variable's value is replaced with the value specified here. If not, a local variable is created. If true is specified, it doesn't look up any parent ID space.
[Optional][Default: true]
Specifies the condition to evaluate this element. This element is ignored if the value specified to this attribute is evaluated to false.