Subject: Re: [xsl] Does the count() function require access to the whole subtree? From: Michael Kay <mike@xxxxxxxxxxxx> Date: Thu, 16 Jan 2014 16:20:51 +0000 |
> 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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