This element serves as the head of a substitution group
for extensibility elements that wish to appear as children of wsdl:binding before wsdl:operation
Abstract Element bindingPreOpExt
The bindingPreOpExt element cannot have "xsi:nil" as an attribute.
The bindingPreOpExt 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:binding before wsdl:operation
</xs:documentation>