<?xml version="1.0" encoding="UTF-8"?>
<form>
    
    <field name="help" type="help" url="documentation/checkbox-field-guide" />
    
    <field name="checked" label="Checked" type="radio" default="0" layout="joomla.form.field.radio.switcher">
        <option value="0">JNO</option>
        <option value="1">JYES</option>
    </field>

    <field name="onclick" type="text" label="On Click" />

    <field name="onchange" type="text" label="On Change" />
  
</form>