WS-Eventing discusses two delivery formats: unwrapped and wrapped but does not specify a standard WSDL for wrapped event delivery. As the result, an Event Source has to assemble different event notifications for different wrap interfaces, thus negating the benefit of wrapped event delivery.

We propose to define a standard wrapped event sink WSDL as follows:
<definitions 
xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:xs="http://www.w3.org/2001/XMLSchema" 
xmlns:gsk="http://schemas.xmlsoap.org/ws/2004/08/eventing/generic_sink" 
targetNamespace="http://schemas.xmlsoap.org/ws/2004/08/eventing/generic_sink">
	<types>
	<xs:schema targetNamespace="http://schemas.xmlsoap.org/ws/2004/08/eventing/generic_sink">
	<xs:complexType name="EventType" mixed="true">
	<xs:sequence>
		<xs:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
	</xs:sequence>
	<xs:element name="Notify" type="gsk:EventType" />
	</xs:complexType>
	</xs:schema>
	</types>
	<message name="notifyEvent">
		<part name="parameter" element="gsk:Notify"/>
	</message>
	<portType name="GenericSinkPortType">
		<operation name="NotifyEvent">
			<input message="gsk:notifyEvent"/>
		</operation>
	</portType>
</definitions>