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[Bug 29983] [XSLT30] Scanning expressions and function calls

From: <bugzilla@jessica.w3.org>
Date: Wed, 16 Nov 2016 17:25:19 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29983-523-e2x40weNhl@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=29983

--- Comment #5 from Michael Kay <mike@saxonica.com> ---
I suggest changing 

The subset of expressions that qualify as scanning expressions is very similar
to the subset that qualify as motionless patterns, and a possible evaluation
strategy for scanning expressions is to examine each descendant of the context
node and test whether it matches the corresponding pattern.

to:

Expressions that qualify as scanning expressions would also qualify as
motionless patterns, and a possible evaluation strategy for scanning
expressions is to examine each descendant of the context node and test whether
it matches the corresponding pattern.

In the interests of simplicity, however, the set of expressions that are
treated as scanning expressions has been kept to a minimum. It excludes, for
example, expressions that use operators such as union, except, and intersect,
and expressions that contain motionless predicates, even though these might be
amenable to a similar evaluation strategy.

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