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[Bug 24619] Conditional using of packages

From: <bugzilla@jessica.w3.org>
Date: Fri, 28 Mar 2014 12:06:03 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-24619-523-Kj35oqU1SZ@http.www.w3.org/Bugs/Public/>

--- Comment #4 from Michael Kay <mike@saxonica.com> ---
I like the idea of static AVTs but it's not easy to find a good solution to the
compatiblity problem. I propose:

for any element in the XSLT namespace,
for any permitted attribute A of that element that is in no-namespace
there is another permitted attribute _A (the same attribute name, prefixed with
an underscore), whose value is a static AVT for computing the value of A.

If both A and _A are present, A is ignored.

A static AVT is evaluated in the same way as an ordinary AVT, but using the
rules for static expressions.

For example

<xsl:include _href="library_v{$version}.xsl"/>

The result of evaluating a static AVT may be a dynamic AVT, but we won't go out
of our way to make this easy.

We allow the mechanism even for attributes with static significance, such as
static="yes|no" and use-when.

We won't include the extra attributes in the schema for XSLT 3.0 (we already
ignore the implications of xsl:use-when processing).

We won't allow the mechanism for xsl: prefixed attributes on literal result

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