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