Custom Data Type representation in Service WSDL

I created a custom data type, called GenderType. I used it in my vocabulary, rule sheet and rule tests. Then deployed it to my local server. But when inspecting the WSDL, I could not see the type definition that I expected as below.

Did I miss some flag to be check? I read about strict checking to be disabled for studio testing but to be enabled for prod deployment. 

<s:simpleType name="GenderType">
<s:restriction base="s:string">
<s:enumeration value="M" />
<s:enumeration value="F" />
</s:restriction>
</s:simpleType>