A function is declared with a name that is not in a namespace. All function names must be in a namespace. Note that default element namespace declarations do not apply to function names.
To remedy this, revise your function name to include a namespace prefix. In a main module, you can use any prefix that is declared in the prolog or the predeclared prefix local
. In a library module, you must use the prefix that is mapped to the target namespace of the module.
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