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[Bug 29079] [xslt 3.0] Support for arrays in XSLT 3.0

From: <bugzilla@jessica.w3.org>
Date: Mon, 14 Sep 2015 09:40:38 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29079-523-tiYXz1ZTkV@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=29079

Michael Kay <mike@saxonica.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
            Summary|[xslt 3.0]                  |[xslt 3.0] Support for
                   |xsl:where-populated and     |arrays in XSLT 3.0
                   |empty arrays                |

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
I was asked to look more generally at what is needed to support arrays in XSLT
3.0, assuming that the XPath 3.1 option is implemented.

The following changes are proposed:

Section 2.1: Terminology

When introducing the term "atomization" add a statement that the definition of
atomization is extended in XPath 3.1 to apply to arrays, and that the extended
definition applies to an XSLT processor that supports XPath 3.1.

Section 2.1: Terminology

Introduce SequenceType as a defined term, defined by reference to either XPath
3.0 or XPath 3.1 as appropriate; and replace links throughout the spec where
SequenceType links directly to XPath 3.0 by a reference to this defined term.
(This has the effect of making it clear that array types are allowed wherever
we allow a SequenceType, provided XPath 3.1 is supported). 

Section 5.7.1: Constructing complex content

Add before list item 2, a new rule:

2. Any array in the sequence is flattened by applying the array:flatten
function.

(With a suitable note that points out this only arises if XPath 3.1 is
supported).

Note: array:flatten replaces an array by the sequence-concatenation of its
members, recursively. It does not atomize any nodes contained in the array.

Section 6.7: Built-in template rules

Handle arrays as described in
https://lists.w3.org/Archives/Public/public-xsl-wg/2015Sep/0004.html

Section 8.4.1: add to the set of things that are "deemed-empty": An array whose
size (number of members) is zero.

Changes to section 19 (Streamability) will be addressed separately.

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