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Re: Welcome to the RDF*/SPARQL* mailing list

From: Andy Seaborne <andy@apache.org>
Date: Fri, 9 Aug 2019 14:09:58 +0100
To: public-rdf-star@w3.org
Message-ID: <1e9c5634-85ed-1035-3f1e-27af14e67bd1@apache.org>
Intro: Andy Seaborne

I have the pleasure of working with Richard at TopQuadrant.

Previous, I have worked on SPARQL and RDF (for the latter, a certain 
amount around syntax alignment of Turtle).

For RDF* I'm interested in hearing what people are using it for and how 
it interacts with the idea that an RDF triple is "true" regards of the 
rest of the graph. Making statements about triples, whether 
probabilities or other conditions on the triple (including (bi)temporal 
usage) changes that from an application POV. Maybe we are moving to a 
more syntactic view of RDF?

On the SPARQL* side, I'm interested hearing about implementation 
experience, for example in the balance in implementation for RDF* as it 
relates to data when RDF* is not present.

I don't think there are any fundamental problems - it is a matter of 
making choices and explaining them, some of which may be "best practice" 
around usage and modelling.


On 06/07/2019 11:11, Olaf Hartig wrote:
> Hi all,
> I just wanted to welcome everyone who has already subscribed to this list!
> The main purpose of this list is to have a place where folks can ask and
> discuss questions related to the RDF*/SPARQL* approach and how to use this
> approach.
> If you are here to help or support the work on the submission document about
> RDF*/SPARQL*, I will send another email later to share details about how we
> are going to do this. Given that the vacation period here has started,
> probably not much is going to happen anyways during the next weeks.
> In the meantime, maybe, everyone who has joined the list may introduce
> themselves; who are you and what's your interest in RDF*/SPARQL*?
> For myself, I simply list the documents I wrote about about RDF*/SPARQL* with
> a brief summary of what each of them provides:
> 1/ As an introductory document I created the short position statement that I
> wrote for the W3C workshop in March 2019 in Berlin. This position statement
> provides a brief motivation and an overview of the approach, a summary of its
> properties, and pointers to other publications and material.
> http://blog.liu.se/olafhartig/2019/01/10/position-statement-rdf-star-and-sparql-star/
> 2/ "Foundations of an Alternative Approach to Reification in RDF"
> http://arxiv.org/pdf/1406.3399
> This is the initial document that I wrote together with Bryan Thompson. The
> main contributions of this document are a formal definition of the RDF* data
> model, a mapping from RDF* to pure RDF with the RDF reification vocabulary, a
> definition of the Turtle* grammar, a formal definition of SPARQL*, and a precise
> specification of how SPARQL* (as a query language) extends the W3C
> recommendation of the SPARQL 1.1 Query Language.
> 3/ "SPARQL* Update"
> http://blog.liu.se/olafhartig/documents/sparql-update/
> This document specifies SPARQL* Update, which is an RDF*-specific extension of
> SPARQL Update.
> 4/ "Foundations of RDF* and SPARQL* - An Alternative Approach to Statement-
> Level Metadata in RDF"
> http://olafhartig.de/files/Hartig_AMW2017_RDFStar.pdf
> This document is a research paper that looks at redundancy in RDF* graphs, and
> shows that the reification-based mappings from RDF* to RDF and from SPARQL* to
> SPARQL possess two desirable properties: they are information preserving and
> query result preserving.
> 5/ "Reconciliation of RDF* and Property Graphs"
> http://arxiv.org/pdf/1409.3288
> This document describes the relationship between RDF* and the Property Graph
> data model. More technically, this document provides two formal mappings from
> RDF* graphs to Property Graphs, and one such mapping in the other direction
> (PG to RDF*).
> Additionally, together with some of my students, we have developed an RDF*/
> SPARQL* extension of the Java RDF framework Apache Jena to provide a
> collection of tools and Java libraries to process RDF* data and SPARQL*
> queries. See: https://github.com/RDFstar/RDFstarTools
> Moreover, we have some preliminary extension of these tools that connect RDF*
> and Property Graphs: https://github.com/RDFstar/RDFstarPGConnectionTools
> Olaf
> -----
> Dr. Olaf Hartig, Docent
>   Associate Professor (Universitetslektor, docent)
>   Division for Database and Information Techniques (ADIT)
>   Department of Computer and Information Science (IDA)
>   Linköping University
>   Website: http://olafhartig.de
>   Office: Building B, Ground floor, Room 2B:478
>   Postal address:
>        Dept. of Computer and Information Science (IDA)
>        Linköpings universitet
>        SE-581 83 Linköping
>        SWEDEN
Received on Friday, 9 August 2019 13:10:23 UTC

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