Re: Adding a list-valued property

On Nov 25, 2013, at 1:24 PM, Judson Lester <nyarly@gmail.com> wrote:

> I think what you want is:
> 
> r << [s, p, l.subject]
> 
> That's just off the top of my head though.

That would work, but of course, you’d also want to add the list to the graph for it to be included in the dump. I think Ian’s use case should probably work, and it indicates that there’s something missing both in the List implementation and the tests. It’s a natural thing to want to do.

Note that in the 1.0.x versions, RDF::List extends RDF::Resource, which would make you believe that a list is a first-class item (Graph does to). This behavior is removed in the 1.1 versions they extend RDF::Value instead. I’m trying to push out all new versions of the RDF gems, but am stuck in some odd Sinatra/Rake behavior at the moment; I’ll make sure this is addressed then.

Similarly, you might think that doing g = RDF::Graph.load(“foo”), r << [s, p, g] would add the graph as an anonymous named graph to the repository; this would be worth implementing/validating too.

Ian, perhaps you’d raise an issue against RDF.rb.

Gregg

> On Mon, Nov 25, 2013 at 1:19 PM, Ian Dickinson <i.j.dickinson@gmail.com> wrote:
> Hi Gregg,
> I'm doing something wrong trying to add a triple whose object is a
> list. Basically what I'm trying to create is:
> 
>     :s :p (1 2 3).
> 
> Here's what I tried:
> 
> 2.0.0-p247 :003 > r = RDF::Repository.new
>  => #<RDF::Repository:0x15b1ac0()>
> 2.0.0-p247 :004 > l = RDF::List[1,2,3]
>  => #<RDF::List:0x16b6cf4(RDF::List[1, 2, 3])>
> 2.0.0-p247 :005 > s = RDF::Resource.new("http://example.org/s")
>  => #<RDF::URI:0x18d91f8(http://example.org/s)>
> 2.0.0-p247 :006 > p = RDF::Resource.new("http://example.org/p")
>  => #<RDF::URI:0x1abcd1c(http://example.org/p)>
> 2.0.0-p247 :007 > r << [s,p,l]
>  => #<RDF::Repository:0x15b1ac0()>
> 2.0.0-p247 :008 > r.dump(:turtle)
>  => "\n<http://example.org/s> <http://example.org/p> _:g24109960 .\n"
> 2.0.0-p247 :009 > r << l
>  => #<RDF::Repository:0x15b1ac0()>
> 2.0.0-p247 :010 > r.dump(:turtle)
>  => "\n<http://example.org/s> <http://example.org/p> _:g24109960
> .\n\n(1 2 3) a <http://www.w3.org/1999/02/22-rdf-syntax-ns#List> .\n"
> 
> I'm sure I'm doing something dumb, but I'm not sure what to change. Suggestions?
> 
> Thanks,
> Ian
> 
>