This element serves as the head of a substitution group
for extensibility elements that wish to appear as children of wsdl:interface after wsdl:operation
Abstract Element interfacePostOpExt
The interfacePostOpExt element cannot have "xsi:nil" as an attribute.
The interfacePostOpExt element in XML instance can be substituted with other elements.
<xs:documentation>
This element serves as the head of a substitution group
for extensibility elements that wish to appear as children of wsdl:interface after wsdl:operation
</xs:documentation>