LPG many-to-many

I’d like to flesh out the point I was making in yesterday’s WG meeting [0] about how many-to-many reifications can be interpreted in LPGs.

I see three variants of many-to-many reifications in RDF:


1) different statement co-denote
   e.g.

    :r rdf:reifies <<( :Alice :likes :Bob )>> .
    :r rdf:reifies <<( :Bob :likes :Alice )>> .
    :r rdf:reifies <<( :Robert :likes <Alice@example.com> )>> .
    :r :source :Carol .


2) different statements are grouped for easier annotation
   e.g. by pfps in yesterday’s WG meeting

    :r rdf:reifies << :alice :age 53 >> .
    :r rdf:reifies << :bob :age 54 >> .
    :r rdf:reifies << :zeke :age 22 >> .
    :r :source :census .
    :r :retrieved "20 jun 2024"^^xsd:date .


3) different statements together describe an entity
   e.g. by enrico in yesterday’s WG meeting

    << :w2 | :liz :married :richard >> a :Marriage ; :starts 1975 .
    << :w2 | :richard :married-in :las-vegas >> :best-man :jim-benton .


In cases 1 and 2 I see absolutely no problem, and no added burden on the LPG side, in converting each RDF reified term into an LPG edge and annotating each such LPG edge with the annotations attributed in RDF to their common reification identifier.

In case 3 such annotations might sometimes make not much sense on the individual triples that together make up the reification. However, that probably would not be harmful either, and in the example above it even does make sense. 

I’d like to see an example where such a simple conversion strategy is harmful. Maybe it would contain hints for less drastic ways to avoid meaningless or even harmful conversions of many-to-many reifications to LPG than the introduction of a hypothetical LPG-profile with a reduced set of supported features. 


Best,
Thomas


[0] https://www.w3.org/2024/08/08-rdf-star-minutes.html

Received on Friday, 9 August 2024 09:37:17 UTC