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[Bug 22937] [xslt 3.0] Rules for streamable patterns

From: <bugzilla@jessica.w3.org>
Date: Tue, 13 Aug 2013 11:53:20 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-22937-523-vP8uP3Op92@http.www.w3.org/Bugs/Public/>

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
I also propose to refine the rules for expressions that return booleans as

(a) allow a return type of S where S satisfies subtype(S, xs:boolean?) - which
allows subtypes of xs:boolean as well as xs:boolean itself

(b) allow "treat as xs:boolean" - again allowing subtypes

I wonder whether we should also allow expressions that are statically known to
return nodes? For example it seems unreasonable to disallow


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