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Re: oa:List spec

From: Antoine Isaac <aisaac@few.vu.nl>
Date: Thu, 2 May 2013 13:22:58 +0200
Message-ID: <51824C92.1030204@few.vu.nl>
To: public-openannotation <public-openannotation@w3.org>
Hi Rob!


  
> I agree that the turtle is incorrect, but not what is incorrect :)
>
> The typo is the use of []s rather than ()s which imply a collection and rdf:nil
>
> http://www.w3.org/TeamSubmission/turtle/#sec-collections
>
> Thus the correction would be:
>
> <list1>  a oa:List, rdf:List ;
>      oa:item<selector1>,<selector2>  ;
>      rdf:first<selector1>  ;
>      rdf:rest (<selector2>  ) .
>



OK!


>
> This does bring up the question as to whether the list should be the object, or should be referenced from the object.
>
> In other words should the above instead be:
>
> <list1> a oa:List ;
> oa:item <selector1>, <selector2> ;
> oa:hasList (selector1 selector2) .
>
> Which might serialize more naturally, but would be a departure from the other multiplicity objects.


I'm not very much in favor of reverting our previous choice for serialization-based reasons only...

Antoine


>
> On Thu, May 2, 2013 at 8:38 AM, Antoine Isaac <aisaac@few.vu.nl <mailto:aisaac@few.vu.nl>> wrote:
>
>     Hi Rob,
>
>     You are right, well spotted!
>     The rdf:nil should indeed be present to indicate that the list is "closed".
>
>     Best,
>
>     Antoine
>
>
>
>         I \think/ the following is meaningful and right about
>         http://www.openannotation.org/__spec/core/20130208/__multiplicity.html#List <http://www.openannotation.org/spec/core/20130208/multiplicity.html#List>
>
>         1. The turtle example doesn't specify that the list ends in rdf:nil
>         although the picture does. I think you need something like
>         rdf:rest [ rdf:first<selector2> ;
>         rdf:rest rdf:nil ]
>         as the end of<list1>
>
>         2. Well, the spec doesn't actually require or even suggest an oa:List
>         should be terminated by rdf:nil, but IMO it would be a good help for
>         consumers. Maybe those looking at the rdf ordering problem already
>         have discussed this issue.
>
>
>         --
>         Robert A. Morris
>
>         Emeritus Professor of Computer Science
>         UMASS-Boston
>         100 Morrissey Blvd
>         Boston, MA 02125-3390
>
>         IT Staff
>         Filtered Push Project
>         Harvard University Herbaria
>         Harvard University
>
>         email: morris.bob@gmail.com <mailto:morris.bob@gmail.com>
>         web: http://efg.cs.umb.edu/
>         web: http://wiki.filteredpush.org
>         http://www.cs.umb.edu/~ram
>         ===
>         The content of this communication is made entirely on my
>         own behalf and in no way should be deemed to express
>         official positions of The University of Massachusetts at Boston or
>         Harvard University.
>
>
>
>
Received on Thursday, 2 May 2013 11:23:27 UTC

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