[Bug 19504] [QT3TS] instanceof139

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19504

--- Comment #2 from Tim Mills <tim@cbcl.co.uk> ---
Oh dear.  I feared that was the answer which is why my argument resorted to
"clearly" once I got to derives-from.

I have a horrible feeling that this means that there is a mismatch between the
static typing and dynamic evaluation rules.

declare variable $p as s:dateOrDateTime external;
declare variable $q as s:approximateDate := $p

$p, $q

is a static type error, even though it can never fail.  Do you agree?

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