Re: Introduction

Hello everyone,

It is time to introduce myself :-). I am Hala Skaf-Molli working at the
university of Nantes, France. I mainly work on
decentralized collaborative works and the Semantic Web, focusing on areas
such as
decentralized semantic data management, Read/Write semantic data,
federation engines, and SPARQL sampling. I have made contributions on
 CRDT, including:

   - The first CRDT for RDF data and text : developed for distributed
   semantic wiki with total replication, enabling  peer to peer semantic
   wiki <https://hal.science/inria-00432210v1>.
   -  CRDT for decentralized semantic wikis designed for partial
   replication based on social networks, supporting Multi-synchronous
   Collaborative Semantic Wikis <https://hal.science/inria-00432209v1>.This
   was implemented as an extension to Semantic MediaWiki DSMW: Distributed
   Semantic MediaWiki <https://hal.science/inria-00540209v1>.
   - CRDT for RDF stores: Created C-Set : a Commutative Replicated Data
   Type for Semantic Stores <https://hal.science/inria-00594590v1>
   - CRDT for Read/Write Linked Data: Introduced Live Linked Data:
   Synchronizing Semantic Stores with Commutative Replicated Data Types

In my research team, we have extensively worked on CRDT and made numerous
scientific contributions. I can cite:


   -

   LSEQ: an Adaptive Structure for Sequences in Distributed Collaborative
   Editing <https://hal.science/hal-00921633v1>
   -

   Optimistic Replication for Massive Collaborative Editing
   <https://hal.science/inria-00071218v1>
   -

   Logoot: A Scalable Optimistic Replication Algorithm for Collaborative
   Editing on P2P Networks <https://hal.science/inria-00432368v1>


I am happy to hear about your interest in our work and look forward to
discuss
these topics further with you all.

Best,
---
Hala

Le ven. 22 nov. 2024 à 04:24, <niko@nextgraph.org> a écrit :

> Hello everyone,
>
> Very pleased to meet you Pieter, and to see all the awesome work you
> have done with your peers, on LDES, TREE, and Linked Data Fragments that
> I think is also from the same people, and that I really like.
>
> Thanks for the invitation to participate on the future of TREE!
>
> On 21/11/24 10:55 am, Pieter Colpaert wrote:
> > [...] we will need to do conflict resolution and I think this should
> > probably first be defined in this CG.
>
> Indeed, here we have gather specially for that!
>
> And I forgot to introduce NextGraph, which is a local-first (CRDT based)
> quadstore (among other things), on top of which we offer (soon) some
> Solid APIs, thanks to our collaboration with ActivityPods.org
>
> The CRDT we implemented is based on the paper "Synchronizing Semantic
> Stores with Commutative Replicated Data Types" of Luis Daniel Ibáñez,
> Hala Skaf-Molli, Pascal Molli, Olivier Corby.[1]
>
> By modifying the oxigraph [2] triplestore of Thomas Tanon to encode the
> causal past of each SPARQL UPDATE, we can implement in NextGraph the
> OR-set (Observed Remove Set) described in the paper.
>
> The conflict resolution is pretty straightforward : in case of
> concurrent DELETE and INSERT of the same quad, the INSERT wins.
>
> We use the generic DAG of commits of NextGraph to encode the causal
> relationship between SPARQL UPDATES, which is also end to end encrypted,
> but that's not the topic here.
>
> Thanks to our implementation, we can offer a "time travel" feature too,
> where each previous revision of any RDF Resource (a named graph), can be
> queried, with SPARQL, just by entering the commit ID of the SPARQL
> UPDATE representing the specific revision that we want to query, as the
> named graph of that SPARQL QUERY.
>
> Hala Skaf-Molli, who is one of the authors of the paper, is present in
> this very Community Group.
>
> Looking forward discussing this topic with you all !
>
> BTW, I am curious Pieter to hear more about "Trust Flows,
> interoperability from write to read" that you presented recently. If it
> is not relevant to the scope of this Community Group, feel free to send
> me a personal email.
>
> Cheers,
> Niko
>
> [1] https://inria.hal.science/hal-00686484/document
>
> [2] https://github.com/oxigraph/oxigraph
>
>