XQuery using fn:QName in OSB

Question

Is fn:QName available to use in XQuery within the OSB? I tried but keep get the following error message...
line 5, column 10: {err}XQ0017: "{http://www.w3.org/2004/07/xpath-functions}QName": unknown function (or number of arguments (2) is wrong)
My xquery is below...
declare variable $localname as xs:string external;
declare variable $namespace as xs:string external;
declare variable $cause as element()? external;
element {fn:QName($namespace,$localname)} {
<validation-error>{$cause}</validation-error>
}

Answer 1

The use case is to generate a qname by passing in a namespace and localname. We have different types of exceptions that have different namespaces and localnames but contain exactly the same content. The requirement is to create an xquery function that can be reused to create the exceptions by passing in the namespace and local name of the top level exception element.