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[Bug 28494] [QT3TS] step-expr-si-1"

From: <bugzilla@jessica.w3.org>
Date: Thu, 16 Apr 2015 12:02:54 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-28494-523-NSEQYuqWZ0@http.www.w3.org/Bugs/Public/>

--- Comment #5 from Michael Kay <mike@saxonica.com> ---
>We begin by optimizing $baseElement.  This expression has static type empty
sequence, therefore it optimizes itself to (). 

I think that's too dangerous. The user is asserting that it will be an empty
sequence, but they are also asking for that assertion to be checked, in my
view. This is the rule that says cardinality checks should not be bypassed.

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