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[Bug 25185] Usage absorption can take crawling expressions when TDU derives from xs:anyAtomicType

From: <bugzilla@jessica.w3.org>
Date: Fri, 28 Mar 2014 10:04:56 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-25185-523-73bj5ifwv5@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=25185

--- Comment #2 from Michael Kay <mike@saxonica.com> ---
For info, Saxon handles this case because before it does streamability
analysis, it does type checking, and where an expression such as
string(//title) expects a singleton, it rewrites it as
string(zero-or-one(data(//title))). The zero-or-one() makes it streamable under
the current rules.

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