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

My intro:

Richard Cyganiak

Software engineer at TopQuadrant

Editor of RDF 1.1 Concepts & Abstract Syntax and a number of other W3C recommendations

My perspective on RDF*/SPARQL*:

1. It potentially addresses some significant use cases that currently are cumbersome to solve with the RDF stack.

2. Between the RDF reification vocabulary, named graphs, and now RDF*/SPARQL*, there are three different overlapping solutions to the problem of “data about data” in RDF. This creates an education/messaging problem and some work will be needed to guide the community.

3. If RDF*/SPARQL* were to become part of the official W3C recommendation stack, it would have a significant ripple effect where many documents would need to be updated over time. Having worked on several W3C recommendations, this is something I'd like to help with.

4. I have concerns about the RDF*/SPARQL* syntax that I'd like to discuss at some point.

Looking forward to productive collaboration.

Richard




> On 6 Jul 2019, at 11:11, Olaf Hartig <olaf.hartig@liu.se> 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 Monday, 8 July 2019 10:09:30 UTC