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Re: Error in test or error in spec?

From: Gregg Kellogg <gregg@kellogg-assoc.com>
Date: Wed, 7 Mar 2012 13:17:51 -0500
To: Ivan Herman <ivan@w3.org>
CC: W3C RDFWA WG <public-rdfa-wg@w3.org>
Message-ID: <5AE30426-96FC-4703-8F84-3AFEED320B1E@kellogg-assoc.com>
On Mar 7, 2012, at 3:24 AM, Ivan Herman wrote:

> Small remarks...
> On Mar 7, 2012, at 11:11 , Ivan Herman wrote:
> 
>> This is what the CR phase is good for: reveal corner cases!
>> 
>> A simplified version of test #58 looks as follow (simplified, because in the original tests there were two, structurally identical foaf:Person statements, but it is unnecessary here):
> 
> Oops, sorry, I did not do any change after all:-)
> 
>> 
>>   <div about="http://www.example.org/#ben" rel="foaf:knows">
>>     <p typeof="foaf:Person" property="foaf:name">Mark Birbeck</p>
>>     <p typeof="foaf:Person" property="foaf:name">Ivan Herman</p>
>>   </div>
>> 
> 
> [snip]
> 
>> 
>> My conclusion for now: the test is wrong. We should redo altogether
> 
> To be more precise: we should do a new test for the RDFa 1.1 case and keep the old one for the RDFa 1.0 case!

I do see some code in my processor which is inconsistent with Step 5, I wonder if something went missing at some point?

1) In 5.1, if @about defines a new subject, then @typeof should create a typed_resource based on that subject, and not a new BNode.
2) My code skips step 5.1 if there are incomplete triples, which there are in this case, so I proceed to step 5.2, which creates new_subject as a new BNode, and sets typed_resource to that BNode.

I don't have access to the RDFa Core 1.1 CVS history, so I can't tell if this was something that was added and then lost in a subsequent edit. It seems to make sense that we would have considered the case where incomplete triples are created as having an effect on the treatment of @typeof creating a new BNode, or applying to the chained subject evidenced by the incomplete triples.

I can see that I explicitly added the check for incomplete triples on November 11th, just after we adopted the behavior; perhaps it was something we discussed but did not formalize? I admit to being somewhat fuzzy on the topic.

Basically, these are the steps my processor takes:

root>body>div Step 6: new_subject => <http://example.org/#ben>
root>body>div Step 10: incompletes => rels: foaf:knows
root>body>div>p[0] Step 5: new_subject => _:a (parent object), typed_resource => _:a
root>body>div>p[0] Step 7: typeof => foaf:Person => {_:a a foaf:Person .}
root>body>div>p[0] Step 11(1.1) => plain literal => {_:a foaf:name "Mark Birbeck"}
root>body>div>p[0] Step 12 => complete incompletes => {<http://example.org/#ben> foaf:knows _:a}
root>body>div>p[1] Step 5: new_subject => _:b
root>body>div>p[1] Step 7: typeof => foaf:Person => {_:b a foaf:Person .}
root>body>div>p[1] Step 11(1.1) => plain literal => {_:b foaf:name "Ivan Herman"}
root>body>div>p[1] Step 12 => complete incompletes => {<http://example.org/#ben> foaf:knows _:b}

which results in output that is more consistent with RDFa 1.0:

<http://www.example.org/#ben> foaf:knows
    [ a foaf:Person; foaf:name "Mark Birbeck"],
    [ a foaf:Person; foaf:name "Ivan Herman"] .

Gregg

> Ivan
> 
> 
> 
>> because, of course, with those values it looks weird and, I guess, the goal was to use it as a test for hanging rels:
>> 
>>  <div about="http://www.example.org/#ben" rel="foaf:knows">
>>     <p typeof="foaf:Person"><span property="foaf:name">Mark Birbeck</span></p>
>>     <p typeof="foaf:Person"><span property="foaf:name">Ivan Herman</span></p>
>>   </div>
>> 
>> which indeed results in 
>> 
>> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
>> 
>> <http://www.example.org/#ben> foaf:knows [ a foaf:Person;
>>           foaf:name "Mark Birbeck" ],
>>       [ a foaf:Person;
>>           foaf:name "Ivan Herman" ] .
>> 
>> 
>> 
>> Thoughts?
>> 
>> Ivan
>> 
>> 
>> ----
>> Ivan Herman, W3C Semantic Web Activity Lead
>> Home: http://www.w3.org/People/Ivan/
>> mobile: +31-641044153
>> FOAF: http://www.ivan-herman.net/foaf.rdf
>> 
>> 
>> 
>> 
>> 
> 
> 
> ----
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
> mobile: +31-641044153
> FOAF: http://www.ivan-herman.net/foaf.rdf
> 
> 
> 
> 
> 
Received on Wednesday, 7 March 2012 18:22:24 UTC

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