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[Bug 27668] [xslt 3.0] (@a, @b) is not streamable

From: <bugzilla@jessica.w3.org>
Date: Sat, 10 Jan 2015 00:07:27 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-27668-523-hH6np9rnTG@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=27668

--- Comment #2 from Michael Kay <mike@saxonica.com> ---
>After this proposed change, the above expression hits an ambiguity, as there is no more "a type", but there is now a "collection of types" (attribute and element nodes), of which one would yield U' inspection, and the other would yield U' absorption.

In fact, the static type of an operand is by definition a U-Type, and the
U-Type of (self::p, @lang) is U{element(), attribute()}. The intersection of
this with U{element(), document-node()} is NOT U{}, therefore U' is U. I think
there is no ambiguity.

>in the GSR we speak of "The static type T", while in fact this is a union of several types

The definition of the "static type" of an expression says that it is a U-Type.
Would it be clearer if we called it the "static U-Type" of an expression?

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