- From: Stefan Kokkelink <skokkeli@mathematik.uni-osnabrueck.de>
- Date: Wed, 27 Jun 2001 11:00:40 +0200
- To: Jeremy Carroll <jjc@hplb.hpl.hp.com>
- CC: www-rdf-interest@w3.org
Jeremy Carroll wrote:
>
> I, foolishly, am looking at writing another RDF parser. (ARP?).
>
> In my design stages I stumbled across this little teaser:
>
> what statements does the following correspond:
>
> <rdf:RDF xmlns:rdf="..." xmlns:a="...">
> <rdf:Description aboutEach="#self" bagId="self">
> <a:prop>value</a:prop>
> </rdf:Description>
> </rdf:RDF>
this should generate the following triples:
(genid1, a:prop, 'value') /* the statement
(#self, rdf:type, rdf:Bag) /* the bag of reifications
(#self, rdf:_1, genid2) /* the element of the bag
(genid2, rdf:type, rdf:Statement) /* the reification
(genid2, subject ...
(genid2, object ...
(genid2, predicate ...
(genid2, a:prop, 'value') /* aboutEach result
i don't see a problem here, although my own parser
crashes. great example!
> or we can make it a little richer with:
>
> <rdf:RDF xmlns:rdf="..." xmlns:a="...">
> <rdf:Description aboutEach="#self" bagId="self">
> <a:prop>value</a:prop>
> </rdf:Description>
> <rdf:Description about="#self">
> <rdf:_1 rdf:resource="http://bertrand-russell-lives.org/">
> </rdf:Description>
> </rdf:RDF>
>
I don't think this is a valid RDF model. the first
element of the bag is determined by
<rdf:Description aboutEach="#self" bagId="self">
<a:prop>value</a:prop>
</rdf:Description>
the first element is the reification. therefore you can't use
a second rdf:_1. lets use rdf:_2 instead:
(genid1, a:prop, 'value') /* the statement
(#self, rdf:type, rdf:Bag) /* the bag of reifications
(#self, rdf:_1, genid2) /* the first element of the bag
(genid2, rdf:type, rdf:Statement) /* the reification
(genid2, subject ...
(genid2, object ...
(genid2, predicate ...
(#self, rdf:_2, http://bertrand-rus...) /* the second element of the
bag
(genid2, a:prop, 'value') /* aboutEach result
(http://bertrand-rus.., a:prop, 'value') /* aboutEach result
am i missing something?
regards,
stefan
Received on Wednesday, 27 June 2001 05:15:17 UTC