ption</code> property. If the value of this property is <code>true</code>,
 the system interprets the option represented by this <code>SelectItem</code> instance as representing a "no
 selection" option. See <a href="../component/UISelectOne.html#validateValue(jakarta.faces.context.FacesContext,java.lang.Object)"><code>UISelectOne.validateValue(jakarta.faces.context.FacesContext, java.lang.Object)</code></a> and <a href="../component/UISelectMany.html#validateValue(jakarta.faces.context.FacesContext,java.la