Re: inverse property of oa:hasTarget

My gut reaction to the proposal of the inverse was that the same thing
might be achievable by swapping the subject and object while keeping the
oa:hasTarget predicate.

Discovering which annotations are targeting something is nontrivial. And we
don't expect targets to track annotations targeting them. They don't have
that agency in the model.

So I would expect annotations to be loaded into a graph before running the
query. In which case, oa:hasTarget will be there.

If we do expect targets to track annotations targeting them or targets are
otherwise discoverable without the annotation, then oa:targetedBy or
similar might fill a need.

-- Jim

On Wed, Sep 18, 2019, 7:48 PM Robert Sanderson <azaroth42@gmail.com> wrote:

>
>
> All,
>
> This seems very reasonable to me.  Although there wasn't a use case in the
> CG / WG timeframe for inverse relationships, it would not hurt to add them
> to the ontology.
> Given that the ontology isn't covered by publication rules, I also think
> that we could add them as a CG.  Similarly, when the JSON-LD 1.1 work
> finishes, we could also consider a 1.1 context that works more seamlessly
> with other contexts.
>
> The full set of properties defined by the ontology are here:
> https://www.w3.org/TR/annotation-vocab/#properties
>
> In particular, I would foresee the need for:
>
> hasTarget -> isTargetOf
> hasBody -> isBodyOf
> hasSource -> isSourceOf
> hasSelector -> isSelectorOf
> hasState -> isStateOf
> hasScope -> isScopeOf
> hasStartSelector -> isStartSelectorOf
> hasEndSelector -> isEndSelectorOf
> refinedBy -> refines
> styledBy -> styles
>
> We clearly do not need inverses where the range is a literal. And I do not
> think we need inverses for the properties where the range is a Motivation,
> as the inverse would have an enormous number of values in any system.  (The
> same way as an inverse of rdf:type would be pointless)
>
> Thoughts?
>
> Rob
>
>
> On Wed, Sep 18, 2019 at 11:21 PM Marilena Daquino <
> marilena.daquino2@unibo.it> wrote:
>
>> Hi all!
>> I'm currently working on extending the OpenCitations data model [1] with
>> terms from the OA ontology.
>>
>> I was wondering whether is possible to have the inverse property of
>> oa:hasTarget. Specifically I'm mining full-text articles and I'd need to
>> link in-text references (individuals of the class
>> c4o:InTextReferencePointer [2]) with individuals of the class cito:Citation
>> [3] and further annotate the latter.
>>
>> We are going to process and query massive amounts of data and we would
>> like to have something like to build the following pattern (expanded for
>> the sake of readability):
>>
>> ?article frbr:part ?sentence .
>> ?sentence c4o:isContextOf ?intextReference .
>> ?intextReference oa:inverseOfHasTarget ?referenceAnnotation .
>> ?referenceAnnotation oa:hasBody ?citation .
>>
>> Many thanks in advance for your attention!
>>
>> [1] http://opencitations.net/model
>> [2] http://www.sparontologies.net/ontologies/c4o
>> [3] http://www.sparontologies.net/ontologies/cito
>>
>> Marilena Daquino
>> Research assistant /DH.arc, Digital Humanities Advanced Research Centre.
>> Department of Classic Philology and Italian Studies, University of
>> Bologna,
>> 40126, Bologna. Italy
>>
>> @emmedaquino
>>
>
>
> --
> Rob Sanderson
> Semantic Architect
> The Getty Trust
> Los Angeles, CA 90049
>