- From: Chris Welty <cawelty@gmail.com>
- Date: Thu, 27 Mar 2008 07:38:06 -0400
- To: Michael Kifer <kifer@cs.sunysb.edu>
- CC: Jos de Bruijn <debruijn@inf.unibz.it>, RIF WG <public-rif-wg@w3.org>
Michael Kifer wrote: > > OK. But the more general syntax should then be added to FLD -- to keep us > honest. > > Also, this still does not address the issue that the meta syntax is not > accessible to processing by rules. > Let's wait for the next WD for that. -Chris >> >> [1] http://www.w3.org/2005/rules/wiki/Annotations >> >>> Here are some concrete problems. >>> >>> 1. Meta data can be attached to various parts of the rules, not just rules >>> themselves, and this metadata can affect the semantics. >>> A simple example is specifying that the output to a query must be sorted. >>> This changes the semantics, since the answer is not a set any more >>> but a list. >>> >>> 2. Some important types of rule systems are based on prioritized defaults >>> (defeasible, courteous, preference LP). >>> >>> - Here metadata is part of the syntax and of semantics. >>> - Typically metadata consists of rule labels and priority or >>> preference information. >>> - Metadata items are often *terms with variables* and not just strings. >>> >>> 3. The current proposal does not offer any obvious or natural way for the >>> metadata to be processable by a (possibly different) rule set. >>> >>> >>> >>> >>> --michael >>> >> -- >> debruijn@inf.unibz.it >> >> Jos de Bruijn, http://www.debruijn.net/ > > -- Dr. Christopher A. Welty IBM Watson Research Center +1.914.784.7055 19 Skyline Dr. cawelty@gmail.com Hawthorne, NY 10532 http://www.research.ibm.com/people/w/welty
Received on Thursday, 27 March 2008 11:38:44 UTC