<custom-attributes [scope="component|space|page|desktop|session|application] attr1="value1" [attr2="value2"...]/>
It defines a set of custom attributes of the specified scope. You could specify as many as attributes you want. These attributes can be retrieved by the getAttribute method of the Component interface with the specified scope.
<custom-attributes cd="${param.cd}" a.b="ab"/>
[optional][Default: component]
Specifies the scope to which the custom attributes are associated. If not specified, the component enclosing this element is the default scope to use.
[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.