W3C home > Mailing lists > Public > public-lod@w3.org > March 2020

Re: blank predicates

From: KANZAKI Masahide <mkanzaki@gmail.com>
Date: Sat, 28 Mar 2020 23:31:00 +0900
Message-ID: <CAHQ1n3CcCO6uribGikUR0qHaaFkpT-U1saDqk0P7rftpAax89g@mail.gmail.com>
To: Melvin Carvalho <melvincarvalho@gmail.com>
Cc: Linking Open Data <public-lod@w3.org>
Hi Melvin,

Maybe a role model / n-ary relationship would work here.

In schema.org, 'Role' was introduced sometime ago [1] that generalize
n-ary relationship with repeated property. e.g

:Alice schema:relatedTo [
schema:roleName "friend" ;
schema:relatedTo :Bob ].

You may want to assign a generic role name first, and then update the
value when you have more specific idea.

In Japan Search [2], we use "dual" properties approach [3] that
combines the above n-ary structure and simple property, e.g.

:Alice schema:relatedTo :Bob ;
dc:relation [jps:relationType role:friend ;
jps:value :Bob ].

It might be read as a sort of practical way corresponding to RDF* description

<<:Alice schema:relatedTo :Bob>> schema:roleName "friend" .


cheers,

[1] http://blog.schema.org/2014/06/introducing-role.html
[2] https://jpsearch.go.jp/
[3] https://www.kanzaki.com/works/ld/jpsearch/primer/#sec1-2

2020年3月28日(土) 23:21 Margaret Warren <mm@zeroexp.com>:
>
> Hello:
>
> When describing  images with imagesnippets and we build the descriptions (image/scene graphs) with triples -- we try to use one of the 11 relations we have designated as the Lightweight Image Ontology.
>
> Occasionally - I want to create a triple, because I know I will want to semantically search and reason over the subject/object entitis later, but one of those 11 relations is not exactly right.
>
> While it's not perfect - I will sometimes just use lio:isRelatedTo in our namespace as a relation placeholder until Pat (Hayes) and I review it later along with other places I have used it to see if it deserves a more descriptive relation.
>
> I call it a crap relation because it doesn't have any real meaning other than to say there is a relation between the two entities.
>
> Best,
>
> Margaret
>
>
> On 3/28/2020 8:07 AM, Dan Brickley wrote:
>
>
> yup - really just invent a property for it
>
> or say nothing by not adding a triple
>
> unless you have some kind of idea how the things are sort-of related then the triple adds literally no information
>
>
>
> On Sat, 28 Mar 2020 at 10:19, Claus Stadler <cstadler@informatik.uni-leipzig.de> wrote:
>>
>> <> is a relative IRI with an empty string relative to some base IRI - so Linked Data clients will typically replace it with the file:// or http(s):// URL of the document they read from.
>>
>> So don't use that, unless you want location-dependent predicates :)
>>
>>
>> Cheers,
>>
>> Claus
>>
>>
>> On 28.03.20 11:03, Melvin Carvalho wrote:
>>
>>
>>
>> On Sat, 28 Mar 2020 at 10:53, Dan Brickley <danbri@danbri.org> wrote:
>>>
>>>
>>> there are an infinite number of boring relationships that hold between any arbitrary pair of objects; your best bet might be to name one for your application rather than attempt to use generalized (predicateless) rdf
>>
>>
>> So maybe simply <> ?
>>
>> #Alice <> #Bob .
>>
>>>
>>>
>>> Dan
>>>
>>> On Sat, 28 Mar 2020 at 08:57, Melvin Carvalho <melvincarvalho@gmail.com> wrote:
>>>>
>>>> I am working on a information mapping system (aka mind maps)
>>>>
>>>> And I want to have two nodes related to each other
>>>>
>>>> #Alice R #Bob
>>>>
>>>> In the general sense, the type of relationship (predicate) R is not really known at the time of creation.  My software currently does not allow the labeling of edges is the reason (but hopefully in future it will)
>>>>
>>>> I need a way to relate Alice to Bob but I dont have a URI for a predicate.
>>>>
>>>> Is there something that can operate as a "blank predicate"?
>>>>
>>>> Or some existing relations that simply says that two entities or linked / related, without yet knowing how they are related?
>>
>> --
>> Dipl. Inf. Claus Stadler
>> Department of Computer Science, University of Leipzig
>> Research Group: http://aksw.org/
>> Workpage & WebID: http://aksw.org/ClausStadler
>> Phone: +49 341 97-32260



-- 
@prefix : <http://www.kanzaki.com/ns/sig#> . <> :from [:name
"KANZAKI Masahide"; :nick "masaka"; :email "mkanzaki@gmail.com"].
Received on Saturday, 28 March 2020 14:31:25 UTC

This archive was generated by hypermail 2.4.0 : Saturday, 28 March 2020 14:31:25 UTC