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[Bug 29153] [XSLT30] have we created a loop-hole with windowed streaming and copy-of or snapshot?

From: <bugzilla@jessica.w3.org>
Date: Mon, 28 Sep 2015 13:53:57 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29153-523-uiTNhQYeOZ@http.www.w3.org/Bugs/Public/>

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
Perhaps the rule should be that last() is disallowed if its focus-setting
container is consuming (i.e., even if the posture is grounded).

And perhaps the above rule should have an exception that a value comparison or
general comparison is allowed if one operand is position() and the other is
last(), e.g. 

if (position() = last()) ...

because with some limited lookahead that can be streamed easily enough.

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