Bug ID: 26742
Summary: [xslt 3.0] Histogram of preceding sibling counters
Product: XPath / XQuery / XSLT
Version: Working drafts
Component: XSLT 3.0
Assignee: [hidden email] Reporter: [hidden email] QA Contact: [hidden email]
At one time we proposed that a streamed node should carry with it some kind of
set of counters indicating basic information about the number of preceding
siblings of different kinds. I don't believe there is now any functionality in
the spec that relies on this. However, I found a couple of references to the
Section 2.10 "However, constructs (for example, simple forms of xsl:number, and
simple positional patterns) that require knowledge of the number of preceding
elements by name are permitted."
Similarly in 4.6: "Summary data about the preceding siblings of the node, and
of each of its ancestor nodes:
specifically, for each distinct combination of node kind, node name, and type
annotation, a count of the number
of preceding siblings that have that combination of properties. This
information allows patterns such as
match="para" to be used, and it permits some limited use of the xsl:number
I think these two paragraphs are obsolete and should be deleted.
(For info: Saxon's streaming implementation does in fact carry this
information, but makes very little use of it; about the only use I can find is
to support simple positional patterns such as para).
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