Application Data Feature Example: declaration

<description>
  <types>
    <schema targetNamespace="http://foo.example/" xmlns:…
          xmlns:ad="http://www.w3.org/2004/08/wsdl/feature/AD">
    <simpleType name="promoType">
      <sequence>
        <element name="promotionalCode"
                 type="xs:string"
                 minOccurs="0"/>
      </sequence>
    </complexType>
   </schema>
  </types>
  <interface name="customerService">
    <feature uri="http://www.w3.org/2004/08/wsdl/feature/AD"/>
    <operation name="reserveCar">
      <input element="myNS:reserveCarRequest">
        <property
         uri="http://www.w3.org/2004/08/wsdl/feature/AD/data">
          <constraint xmlns:foo="http://foo.example/">
            foo:promoType
          </constraint>
        </property>
      </input>
    </operation>
  </interface>
</description>