W3C home > Mailing lists > Public > public-qt-comments@w3.org > February 2012

[Bug 12455] [XSLT 3.0] Predicates in new-style patterns

From: <bugzilla@jessica.w3.org>
Date: Sun, 19 Feb 2012 21:46:52 +0000
To: public-qt-comments@w3.org
Message-Id: <E1RzEaq-0005zA-LK@jessica.w3.org>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=12455

Michael Kay <mike@saxonica.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Michael Kay <mike@saxonica.com> 2012-02-19 21:46:48 UTC ---
This was discussed during the Feb 2012 F2F. It was felt we should try to
restore the semantic connection between patterns and XPath expressions in order
to avoid surprises in this area (or at any rate, to make it possible to defend
the surprises).

I would suggest doing this as follows.

(a) the construct ~typename is replaced by (.[. instance of typename]). This
substitution is incorporated into the definition of "equivalent expression"

(b) the ability to use union/intersect/except with non-node patterns is dropped

(c) the current rule

An item N matches a PathPattern if N is a node and the result of evaluating the
expression root(.)//(EE) with a singleton focus based on N is a sequence that
includes the node N, where EE is the equivalent expression to the PathPattern,

is replaced by

An item N matches a PathPattern if either of the following applies:

(1) N is a node and the result of evaluating the expression root(.)//(EE) with
a singleton focus based on N is a sequence that includes the node N, where EE
is the equivalent expression to the PathPattern,

(2) N is not a node and the result of evaluating the expression exists(EE) with
a singleton focus based on N is true.

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Received on Sunday, 19 February 2012 21:46:54 UTC

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