- From: pat hayes <phayes@ai.uwf.edu>
- Date: Tue, 4 Sep 2001 13:00:12 -0700
- To: Jan Grant <Jan.Grant@bristol.ac.uk>
- Cc: w3c-rdfcore-wg@w3.org
>On Mon, 3 Sep 2001, Dan Connolly wrote: > > > Again, suppose the graph had a Bag rather than an Alt: > > > > <doc1> <dc:creator> _:a . > > _:a <rdf:type> <rdf:Bag> . > > _:a <rdf:_1> <jan> . > > _:a <rdf:_2> <dan> . > >I don't consider the two to be interchangable. Why? Compare > > http://ioctl.org/rdf/ms/rdfms#108 >"The students in course 6.001 are Amy, Tim, John, Mary, and Sue." >It seems here that the collection itself is truly considered the value >of a property, whereas... > > http://ioctl.org/rdf/ms/rdfms#111 (and #112) >"Here, any one of the items listed in the container value for >DistributionSite is an acceptable value without regard to the other >items." > >In other words, the Alt-collection itself isn't really being considered >the value of the property; the members of the Alt are being considered >so instead.* > > > We don't license the inference that > > <doc1> <dc:creator> <jan>. > > in that case, do we? No. Then why should rdf:Alt have any magic > > associated with it? > >Because clearly they don't behave in the same way, so the analogy isn't >sound. > >I'd rather see Alt go away - the examples in M+S are vague and subject >to this kind of confusion. > >jan > >* although there are two kinds of alternative notion: the one in this >example is "this is true for ever member of the Alt, just pick one" (so >why isn't it just a bag?) Right. Although there is one possible answer in the M&S (an aspect that I ignored), which is that an Alt is required to have at aleast one element, which is the first, and is considered the 'default' value. So an Alt might be a bag with a default first member, maybe. (However, the need for this default suggests that as you say above, the members are the intended values, not the alt container itself.) >as opposed to "this is true for at least one >member of the alt" - which is where you need some MT support (I think). Yes, I think so also. Pat --------------------------------------------------------------------- (650)859 6569 w (650)494 3973 h (until September) phayes@ai.uwf.edu http://www.coginst.uwf.edu/~phayes
Received on Tuesday, 4 September 2001 15:58:55 UTC