This is a proposal for solving the requested issue with current bind-variables.

This new function called xqxq:set-variable($query-key as xs:anyURI, $var-name 
as xs:QName, $value as xs:string*)

fulfills the requested feature of casting an xs:string to the corresponding 
type of a defined external variable.
To be able to create this function a new function to the DynamicContext API had 
to be added, the function is called getValueType which returns a string of the 
type a given variable QName.
And then bringing this function to the xqxq module with the name 
xqxq:variable-type.

I am not sure about the name set-variable since is different from 
bind-variable. Would appreciate suggestions on how to name this new function.
-- 
https://code.launchpad.net/~zorba-coders/zorba/bug1064978/+merge/150696
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