Tag fragment

(must evaluate to java.lang.String)
The identifier of the component that JSF inserts into the component tree. If an identifier is not explicitly specified by the page author, JSF will assign an identifier based on the algorithm that it uses for all components.
(must evaluate to java.lang.String)

Binds the component to a backing bean property, as specified in the JSF specification. The Java language type of this property must be a class that extends javax.faces.component.UIComponent. The scope of the bean on which this property resides must be no wider than request scope. If either of these conditions are not met, the results are undefined.

(must evaluate to java.lang.String)

Controls whether the fragment component is rendered. Valid values for this attribute are either the strings "true" or "false" or an EL expression that evaluates to either "true" or "false".

If this attribute's value is "false" or the value is an EL expression that evaluates to "false", the fragment is not rendered in the page.