XQuery with multiple variable references failing with static analysis error

ODE adds a preamble to XQuery expressions prior to executing them. This preamble includes the namespace declarations and external variable declarations. I got a static analysis error saying that there was a duplicate global variable declaration. I saw the following under the debugger:

...
declare variable $SubmitRequestResponse.SubmitRequestResponse external ;
declare variable $SubmitRequestResponse.SubmitRequestResponse external ;
...

I modified the expression to map the global variable to a local variable and use the local variable multiple times instead of referencing the global variable multiple times. This only produced a single declaration for the variable in the preamble and worked fine.