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

Thank you for the invitation Olaf to join the discussion. I am currently
not having a specific use case for RDF*/SPARQL* but am interested to learn
how this could possibly improve existing workflows in development and

I came to the Semantic Web in 2000 by way of researching the foundations
for context aware geospatial content management systems on the web with a
particular focus on cultural heritage and historical data. My work on the
combination of a RDF query language ( RDQL ) and a Spatial filter was
completed in 2003 and later led me to the development of the geosparql
implementation for Jena in 2007.

20 years on now and I still have a keen interest in Semantic Social
Networks and the Geospatial Semantic Web.  I am a heavy user of the
Davidsonian modelling framework in my own RDF projects and always had a
somewhat ambivalent relationship with the RDF reification approach in the
past, mostly due to the increase in number of triples in the dataset and
the use of bnodes. I  hope the work on RDF*/SPARQL* will help to alleviate
the situation here a little bit.

Looking forward to learn more about RDF*/SPARQL*.


On Sat, Jul 6, 2019 at 11:12 AM 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.
> 2/ "Foundations of an Alternative Approach to Reification in RDF"
> 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"
> 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"
> 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"
> 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:
> Moreover, we have some preliminary extension of these tools that connect
> RDF*
> and Property Graphs:
> 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:
>  Office: Building B, Ground floor, Room 2B:478
>  Postal address:
>       Dept. of Computer and Information Science (IDA)
>       Linköpings universitet
>       SE-581 83 Linköping
>       SWEDEN


Marco Neumann

Received on Tuesday, 9 July 2019 09:39:44 UTC