Subject: Re: Repeated question on selection order From: MARK.WROTH@xxxxxxxxxxx (Wroth, Mark) Date: Tue, 21 Dec 1999 15:12:01 -0800 |
Quoting Wroth, Mark <MARK.WROTH@xxxxxxxxxxx> (me): > But I still have a theoretical question. When I use the code > > (with-mode continuation > (make sequence > (process-node-list > (select-elements (descendants (document-element > (current-node))) > `(scrap (continues ,(attribute-string "id"))))))) > > I am guaranteed by the DSSSL specification (paragraph 12.4.3) that the > process-node-list function will process the node list *in order*. However, > I can't tell from the text of 10.2.5 whether I can guarantee that > select-elements will produce a node list in the order I desire (which is the > order the matching elements appear in the document instance). The practical > examples I've run seem to indicate that Jade, at least, does so. But since > a variation in the selection order would have ... interesting ... > possibilities for introducing bugs into the output program source code, I'd > like to be sure that this is not mere coincidence. > Brandon Ibach <bibach@xxxxxxxxxxxxxx> replies BI> Well, I can't say for sure, as the spec isn't real clear on this BI> issue, but my money is that you'll find Jade's behavior to be the BI> consistent model. BI> Node lists are (according to the intro to Chapter 10) inherently BI> ordered, and the select-elements function is only supposed to filter BI> the node-list. For it to do anything more than that (including BI> reordering it) would be outside of its specification, at least in my BI> mind. BI> So, given that the descendants function, according to the spec, BI> will always return the node list in tree order, you should be safe. :) OK. That's probably as good a guarantee as I'm likely to get, anyway. And there is always a fall back position (making the defining sections in essence a linked list). DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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