Hi,
Thanks Mike for confirming my intuition. And thanks to Dimitre for
taking my second question to its logical limit (I think) and posing it
there. :-)
Cheers, Wendell
Wendell Piez | http://www.wendellpiez.com
XML | XSLT | electronic publishing
Eat Your Vegetables
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On Thu, Jan 16, 2014 at 11:20 AM, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
For example, your pipeline could collect all //x (streaming) and then
reverse them (not streaming).
In principle, you would need only the memory for holding //x (or
rather, copies of //x or pointers to them), not the entire collection
within which they are found.
Generally you can't keep a "pointer" to a streamed node, because it's
transient. But you can keep a copy.
So you should be able to do
reverse(/copy-of(/x))
The result of copy-of(//x) is grounded (it doesn't contain any streamed
nodes), and that makes it amenable to operations such as reverse().
I also had a related question, back in September. It wasn't answered
(rare for this list), either because it wasn't clear, or because XML
Summer School was going on at the time. Or both.
Or possibly because the streaming design was completely up in the air at that
moment because we had just found a major bug. But I think we've still got
some issues with multi-phase streaming that need to be sorted out (that is,
with reading from a stream of nodes that is itself constructed by the
stylesheet), and such use cases need further work: we've got an agenda item
to discuss this.
http://xsl-list.markmail.org/thread/pwuzpcvdoi7eam4h
Michael Kay
Saxonica
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