<camunda:formData xmlns:camunda="http://camunda.org/schema/1.0/bpmn">
  <camunda:formField
      id="stringField"
      label="String Field"
      type="string"
      defaultValue="someString">
    <camunda:properties>
      <camunda:property id="p1" value="property1"/>
      <camunda:property id="p2" value="property2"/>
    </camunda:properties>
    <camunda:validation>
      <camunda:constraint name="readonly" />
      <camunda:constraint name="minlength" config="5" />
    </camunda:validation>
    <camunda:value id="a" name="A"/>
    <camunda:value id="b" name="B"/>
  </camunda:formField>
</camunda:formData>