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BIBFRAME  November 2014

BIBFRAME November 2014

Subject:

Re: [Topic] Types

From:

Karen Coyle <[log in to unmask]>

Reply-To:

Bibliographic Framework Transition Initiative Forum <[log in to unmask]>

Date:

Thu, 6 Nov 2014 13:33:31 -0800

Content-Type:

text/plain

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Parts/Attachments

text/plain (123 lines)

On 11/6/14 12:12 PM, [log in to unmask] wrote:
>> bf:workTitle with domain=bf:Work
>>
>> makes these two statements equivalent, although in #2 you must first infer the type of :X from the predicate "bf:workTitle":
>>
>> :X a bf:Work ;
>>    bf:worktitle [blah] .
>>
>> :X bf:workTitle [blah] .
>>
>> In both cases, the type of :X is bf:Work.
>
> This is predicated on the operation of an inference regime, presumably RDFS or stronger. It is not true under plain RDF entailment.
>
> It's important to notice that assumption when it comes into play. RDF processing does not normally make it, because it is expensive, the expense varying with the strength of inference regime. For a strong regime and for applications that require processing with strong guarantees about response time, the expense can be prohibitive. It is possible to make inference a requirement for Bibframe applications, but I agree with Rob Sanderson: that would be a mistake. It should be possible for a machine to process Bibframe without engaging such machinery, and I say that even though I believe very strongly that inference is the most important frontier for these technologies.
>
> ---
> A. Soroka
> The University of Virginia Library

I don't at disagree, although in other venues I am seeing use of 
inferencing, at least experimentally. But if you *do* include domains 
and ranges for the properties in your ontology, then they should not 
return inconsistencies when presented to a reasoner if someone *does* 
wish to employ inferencing. Having those defined in the ontology means 
that you support inferencing for those who wish to use it. Otherwise, 
why even include domains and ranges in your ontology?

And note that BF uses rdfs and domains and ranges on some properties:

   <rdf:Property rdf:about="http://bibframe.org/vocab/contentCategory">
     <rdfs:domain rdf:resource="http://bibframe.org/vocab/Work"/>
     <rdfs:label>Content type</rdfs:label>
     <rdfs:range rdf:resource="http://bibframe.org/vocab/Category"/>
     <rdfs:comment>Categorization reflecting the fundamental form of 
communication in which the content is expressed and the human sense 
through which it is intended to be perceived.</rdfs:comment>
   </rdf:Property>

You can't prevent anyone from using reasoning on the data. You still 
have to get it right.

kc

>
> On Nov 6, 2014, at 2:46 PM, Karen Coyle <[log in to unmask]> wrote:
>
>> On 11/6/14 8:00 AM, Simon Spero wrote:
>>> On Nov 6, 2014 10:10 AM, "Karen Coyle" <[log in to unmask]> wrote:
>>>
>>>> If the bf:workTitle were of type bf:Work instead of bf:Title, you would get:
>>>>
>>>> <X> rdf:type bf:Work .
>>>> <X> bf:workTitle _:aa .
>>>> _:aa rdf:type bf:Work .
>>>> _:aa bf:titleValue "Here's my title" .
>>>>    
>>>> Does that clear it up?
>>> Ah- now I think I understand-when you are talking about a property being of a certain type, you are talking about the range of the property, not the type of the property itself (ie the thing named bf:workTitle. Did it clear up? :-)
>>>
>> No, actually, I'm talking about the domain of properties, not the range. The domain of the property asserts "instance of class" on the subject of the property relation. So
>>
>> bf:workTitle with domain=bf:Work
>>
>> makes these two statements equivalent, although in #2 you must first infer the type of :X from the predicate "bf:workTitle":
>>
>> :X a bf:Work ;
>>    bf:worktitle [blah] .
>>
>> :X bf:workTitle [blah] .
>>
>> In both cases, the type of :X is bf:Work.
>>
>> For others, perhaps, note that an subject (":X" here) can be of more than one type. So there's nothing wrong with saying:
>>
>> :X a bf:Work;
>>     a bf:mapType;
>>     a bf:digitalObject .
>>
>> if you want to do that. And those types could either be explicit ("a bf:xxx") or inferred. The latter could take advantage of something like
>>
>> bf:coordinates domain=mapType
>> bf:digForm domain=digitalObject
>>
>> And an instance that goes like:
>>
>> :X a bf:Work;
>>     bf:coordinates "blah" ;
>>     bf:digForm <URI-for-PDF> .
>>
>> That's probably not how you'd do forms, but it's the example that came to mind.
>>
>> What this does mean is that you have to be careful what domains you define for your properties, because they add semantics to your     subjects. (The most visible way to test this, IMexperience, is by defining classes as disjoint and then mixing properties from those classes in a single graph. Reasoners come back with an "inconsistent" conclusion, telling you your data doesn't match your ontology.)
>>
>> kc
>>
>>
>>
>>> If the range of workTitle is declared to Work, then the value of the property as well as the subject of the property would also be an instance of bf:Work.
>>>
>>> Is a goal to treat titles as Works in their own right, and to be able to have titleValue asserted directly on X?
>>>
>>> Is a goal to find triples that may be reachable from  instances of Work? In that situation, SPARQL 1.1 sub queries or property paths may do some of the work.
>>>
>>> Outside of SPARQL, some approaches to serving linked data return closely related entities alongside the base object, trading off bandwidth for latency or server load. id.loc.gov does this quite a bit ;the work on linked data fragments looks to combine this with client side query processing.
>>>
>>> Simon
>>>
>> -- 
>> Karen Coyle
>>
>> [log in to unmask] http://kcoyle.net
>>
>> m: +1-510-435-8234
>> skype: kcoylenet/+1-510-984-3600
>>

-- 
Karen Coyle
[log in to unmask] http://kcoyle.net
m: +1-510-435-8234
skype: kcoylenet/+1-510-984-3600

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