Re: datasets mean their default graphs?

On 06/22/2013 03:11 AM, Peter Patel-Schneider wrote:
> I don't see why this is necessary.  Isn't a semantics that gives some
> meaning to RDF datasets a semantic extension of one that doesn't
> bother to give meaning to RDF datasets?  It's not, after all, that the
> RDF semantics prohibits RDF datasets from having meaning.
>
> My worry is that there are people who make the default graph be the
> union of the contents of the named graphs, and thus wouldn't want even
> this minimal semantics.

It seems me that everyone who makes the default graph be the union would 
fall into one of two camps:  (1) they are comfortable with these 
semantics, because they consider all their named graphs asserted anyway, 
or (2) they don't consider their overall dataset to be asserted.    I 
cringe a little at (2), since it seems like a good practice to only 
publish on the open web things you assert, but it's how things already 
are with people publishing RDF Graphs -- people do publish RDF graphs 
they don't mean -- and the situation doesn't seem to be made much worse 
by adding the default graphs of datasets into that set.

       -- Sandro

> peter
>
>
> On Fri, Jun 21, 2013 at 7:52 AM, Pat Hayes <phayes@ihmc.us> wrote:
>> OK, lets try to find a better way to word it. The point we need to get across is that a dataset can be treated just as an uninterpreted data structure, but *if* it is used to convey RDF content then at a minimum, it must be understood to be asserting its default graph. Sandro thinks, and I agree, that this is an essential condition to have in order to support vocabulary-based semantic extensions.
>>
>> Got a better way to word it?
>>
>> Pat
>>
>> On Jun 21, 2013, at 1:38 AM, Peter F. Patel-Schneider wrote:
>>
>>> Given that Semantics doesn't talk about publishing, I don't think that this is a good idea at all.
>>>
>>> peter
>>>
>>> On Jun 19, 2013, at 11:43 PM, Pat Hayes <phayes@ihmc.us> wrote:
>>>
>>>> Have we agreed on Sandro's idea for the meaning of a datastore to be that of its default graph? I would like to add this paragraph to Semantics, section 10:
>>>>
>>>> <p>If a dataset is published as an assertion then it MUST be interpreted to be an assertion of its default graph. Semantic extensions MAY impose extra conditions which require other named graphs to be interpreted in particular ways. </p>
>>>>
>>>> Pat
>>>>
>>>> ------------------------------------------------------------
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>> ------------------------------------------------------------
>> IHMC                                     (850)434 8903 or (650)494 3973
>> 40 South Alcaniz St.           (850)202 4416   office
>> Pensacola                            (850)202 4440   fax
>> FL 32502                              (850)291 0667   mobile
>> phayesAT-SIGNihmc.us       http://www.ihmc.us/users/phayes
>>
>>
>>
>>
>>
>

Received on Saturday, 22 June 2013 11:02:16 UTC