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Re: RDF* implementations and PG/SA modes (updated list)

From: Andy Seaborne <andy@apache.org>
Date: Tue, 18 Aug 2020 18:12:36 +0100
To: Pavel Klinov <pavel@stardog.com>
Cc: public-rdf-star@w3.org
Message-ID: <4d373fb0-9baf-3523-76c7-299f80a3165f@apache.org>


On 17/08/2020 18:21, Pavel Klinov wrote:
> Stardog does (2). Re: (1), it seems orthogonal to the SA vs PG 
> discussion. We can see ourselves supporting that (as well as nesting) if 
> there's demand, we don't expect any technical challenges there.

Some systems documentation talks about storing the annotation triple 
"with the statement". While not saying directly, I wonder if this 
implies subject position, and it is stored in a triple table to be 
stored in one place.

<<:s1 :p1 :o1>> :q <<:s2 :p2 :o2>>

is stored twice maybe.

     Andy


> 
> Cheers,
> Pavel
> 
> On Mon, Aug 17, 2020 at 7:02 PM Andy Seaborne <andy@apache.org 
> <mailto:andy@apache.org>> wrote:
> 
> 
> 
>     On 15/08/2020 17:15, thomas lörtsch wrote:
>      > Thanks for all responses, corrections and additions and an
>     accordingly updated list:
>      >
>      >
>      >    SA  PG  Implementation  Notes - Documentation
>      >
>      >        +   AllegroGraph    in the works -
>     https://lists.w3.org/Archives/Public/public-rdf-star/2020Aug/0021.html
>      >        x   AnzoGraph
>     https://docs.cambridgesemantics.com/anzograph/v2.2/userdoc/lpgs.htm?Highlight=rdf
>      >        x   BlazeGraph
>     https://github.com/blazegraph/database/wiki/Reification_Done_Right
>      >    x       GraphDB
>     http://graphdb.ontotext.com/documentation/9.2/free/devhub/rdf-sparql-star.html
>      >    x       Jena https://jena.apache.org/documentation/rdfstar/
>      >    +   +   N3              deferred -
>     https://github.com/w3c/N3/issues/27#issuecomment-644768502
>      >    x       rdf4j https://rdf4j.org/documentation/programming/rdfstar/
>      >    x   +   rdfjs/N3.js     PG may become configurable soon -
>     https://github.com/rdfjs/data-model-spec/pull/165
>      >    x   x   RubyRDF
>     http://rdf.greggkellogg.net/yard/file.rdf-README.html#rdf-rdfstar
>      >        x   Stardog https://www.stardog.com/docs/#_edge_properties
>      >
>      >
>      >
>      > I see a tendency towards PG mode. Comments from SA implementers
>     suggested that they chose this approach also because going from SA
>     to PG is easier than the other way round. Also some PG implementers
>     don’t seem to be particularily enthused about SA mode.
> 
>     Great survey!
> 
>     Of the PG systems, how many:
> 
>     (1) Implement <<>> in the object position
>     (2) Provide cascading deletion
> 
>     in their current releases?
> 
>           Andy
> 
>      >
>      > Thomas
> 
> 
>      >
>      >
>      >> On 10. Aug 2020, at 21:41, Steve Sarsfield
>     <steve.sarsfield@cambridgesemantics.com
>     <mailto:steve.sarsfield@cambridgesemantics.com>> wrote:
>      >>
>      >> Confirming that for AnzoGraph DB, this chart is correct. We
>     support the property graph style. We don’t currently have any
>     product roadmap planned for separate assertions.
>      >>
>      >>
>      >>
>      >> Steve Sarsfield, AnzoGraph DB
>      >>
>      >>
>      >>
>      >>
>      >>
>      >
>      >
> 
Received on Tuesday, 18 August 2020 17:12:53 UTC

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