Subject: Re: Recognizing "subdocuments" From: "W. Eliot Kimber" <eliot@xxxxxxxxxxxxxx> Date: Fri, 04 Dec 1998 09:59:18 -0600 |
At 05:07 AM 12/4/98 -0500, Norman Walsh wrote: >Suppose that I have a stylesheet that uses (sgml-parse) to load >other documents and then calls (process-node-list) on some >subset of the elements in the document so loaded. > >Is it possible in Jade to write a function that can tell if a node >comes from "the original" document or from one of the documents >that I've loaded with sgml-parse? As long as you have both nodes, you can always compare their grove roots to see if they are the same, e.g.: (define (in-same-grove? node1 node2) (if (equal? (grove-root node1) (grove-root node2)) #t #f)) Unfortunately, in the current DSSSL spec, there is no defined way to look up from the root of a parsed subdoc to see the point at which it was referenced. This would, I think, be a relatively easy extension to write. Note that in a HyTime-aware environment, the HyTime engine would maintain this knowledge for you because it maintains tables of all the node-to-node addresses. If the HyTime system implements the value reference facility, it will also maintain knowledge of those addresses that establish use-by-reference relationships. I realize that Jade is not currently implemented on top of any HyTime engines, but it soon will be implemented (or implementable) on top of TechnoTeacher's GroveMinder/HyMinder system. You could also put it on top of my PHyLIS tool, which provides a HyTime engine as well (although I haven't yet fully implemented the location address part of the HyTime semantic grove, if someone really wanted it, it wouldn't take long to add). Cheers, E. -- <Address HyTime=bibloc> W. Eliot Kimber, Senior Consulting SGML Engineer ISOGEN International Corp. 2200 N. Lamar St., Suite 230, Dallas, TX 75202. 214.953.0004 www.isogen.com </Address> DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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