This element serves as the head of a substitution group
for extensibility elements that wish to appear after the wsdl:import/wsdl:include elements
but before the wsdl:types element
Abstract Element preTypes
The preTypes element cannot have "xsi:nil" as an attribute.
The preTypes 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 after the wsdl:import/wsdl:include elements
but before the wsdl:types element
</xs:documentation>