[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Re: AF and namespaces, once again (was Re: There
Steven R. Newcomb scripsit: > Exactly what I'm wondering, Len. I think so, but I'm > not comfortable enough with RNG yet to commit myself > on this question. I am doing a bit of thinking about what AFNG (to go with RNG) might look like. Preliminary sketch soon. > (And when someone does > this, typically someone else says, "You mean CONCUR?", > whereupon everyone present makes a rude noise. The > CONCUR feature of SGML was an earlier attempt to > address some of the same requirements.) If I understand this, I actually reinvented CONCUR a couple of years ago, when I was first thinking about possible ways of representing non-hierarchical structures. The trick was to choose a Thoroughly Useless Name Char (I forget what I picked originally, but U+06DD ARABIC END OF AYAH will do nicely), and then represent multiple hierarchies as follows: 1) Every distinct hierarchy gets a distinct name, for use in making it real later. 2) Every start-tag is represented as an empty-tag with an element type of HierarchyName+Useless+RealName. 3) Every end-tag is represented as an empty-tag with an element type of HierarchyName+Useless+RealName+Useless. 4) Every empty-tag is represented by a start-tag followed by an end-tag. 5) The whole document is wrapped in a new root element which marks it as being multiple-hierarchy. Then it is easy to pull out a specific hierarchy, by ignoring tags with the wrong hierarchy name and converting the good ones to proper start-tags and end-tags. Likewise it is easy to "bias" toward a particular hierarchy, by converting the tags of the specified hierarchy as above, but leaving the other tags alone. This scheme predates namespaces. -- John Cowan http://www.ccil.org/~cowan cowan@c... Please leave your values | Check your assumptions. In fact, at the front desk. | check your assumptions at the door. --sign in Paris hotel | --Miles Vorkosigan
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