The boolean data type

Scalar data type. true or false.

true|false

dataTypesSample.fls.xml

...
<checkbox id="chkbox">
  <validation>
    <validator cond='{chkbox.checked == false}'
      message="The 'checked' boolean is now true."/>
    <validator cond='{chkbox.checked == true}'
      message="The 'checked' boolean is now false."/>
  </validation>
</checkbox>
...

Figure 267. The validation messages for this checkbox are toggled by the boolean value of its checked property

Related links

Data-binding Reference

The dtl data type