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Mark Baker: Sam and I are still disconnected. Since I don't see the disconnect, I guess we are also meta-disconnected.
Pardon me while I xml-ize your example...
<foo>795</foo>
The relevant portion of the WSDL would look like
<s:element minOccurs="0" maxOccurs="1" name="foo" type="s:int" />
At this point, about all one can determine is that there will be zero to one occurances of an element named foo who's range is constrained to be an int. Toolkits like ASP.NET and Apache Axis can use this information to automate the generation, parsing and verification of such information.
Note: I've said nothing about behavior... only about syntax. Where is the disconnect?