So, in short, DBPedia is turning into a business with a "community edition +
enterprise edition" kind of model?
Sent: Tuesday, May 08, 2018 at 2:29 PM
From: "Sebastian Hellmann" <hellmann(a)informatik.uni-leipzig.de>
To: "Discussion list for the Wikidata project"
<wikidata(a)lists.wikimedia.org>rg>, "Laura Morales" <lauretas(a)mail.com>
Subject: Re: [Wikidata] DBpedia Databus (alpha version)
Hi Laura,
I don't understand, is this just another project built on DBPedia, or a project to
replace DBPedia entirely?
a valid question. DBpedia is quite decentralised and hard to understand in its entirety.
So actually some parts are improved and others will be replaced eventually (also an
improvement, hopefully).
The main improvement here is that, we don't have large monolithic releases that take
forever anymore. Especially the language chapters and also the professional community can
work better with the "platform" in terms of turnaround, effective contribution
and also incentives for contribution. Another thing that will hopefully improve is that we
can more sustainably maintain contributions and add-ons, which were formerly lost between
releases. So the structure and processes will be clearer.
The DBpedia in the "main endpoint" will still be there, but in a way that
nl.dbpedia.org/sparql or
wikidata.dbpedia.org/sparql is there. The new hosted service will
be more a knowledge graph of knowledge graph, where you can get either all information in
a fused way or you can quickly jump to the sources, compare and do improvements there.
Projects and organisations can also upload their data to query it there themselves or
share it with others and persist it. Companies can sell or advertise their data. The core
consists of the Wikipedia/Wikidata data and we hope to be able to improve it and also send
contributors and contributions back to the Wikiverse.
Are you a DBPedia maintainer?
Yes, I took it as my task to talk to everybody in the community over the last year and
draft/aggregate the new strategy and innovate.
All the best,
Sebastian
On 08.05.2018 13:42, Laura Morales wrote:
I don't understand, is this just another project built on DBPedia, or a project to
replace DBPedia entirely? Are you a DBPedia maintainer?
Sent: Tuesday, May 08, 2018 at 1:29 PM
From: "Sebastian Hellmann"
<hellmann@informatik.uni-leipzig.de>[mailto:hellmann@informatik.uni-leipzig.de]
To: "Discussion list for the Wikidata project."
<wikidata@lists.wikimedia.org>[mailto:wikidata@lists.wikimedia.org]
Subject: [Wikidata] DBpedia Databus (alpha version)
DBpedia Databus (alpha version)
The DBpedia Databus is a platform that allows to exchange, curate and access data between
multiple stakeholders. Any data entering the bus will be versioned, cleaned, mapped,
linked and its licenses and provenance tracked. Hosting in multiple formats will be
provided to access the data either as dump download or as API. Data governance stays with
the data contributors.
Vision
Working with data is hard and repetitive. We envision a hub, where everybody can upload
data and then useful operations like versioning, cleaning, transformation, mapping,
linking, merging, hosting is done automagically on a central communication system (the
bus) and then dispersed again in a decentral network to the consumers and applications.
On the databus, data flows from data producers through the platform to the consumers (left
to right), any errors or feedback flows in the opposite direction and reaches the data
source to provide a continuous integration service and improve the data at the source.
Open Data vs. Closed (paid) Data
We have studied the data network for 10 years now and we conclude that organisations with
open data are struggling to work together properly, although they could and should, but
are hindered by technical and organisational barriers. They duplicate work on the same
data. On the other hand, companies selling data can not do so in a scalable way. The loser
is the consumer with the choice of inferior open data or buying from a djungle-like
market.
Publishing data on the databus
If you are grinding your teeth about how to publish data on the web, you can just use the
databus to do so. Data loaded on the bus will be highly visible, available and queryable.
You should think of it as a service:
Visibility guarantees, that your citations and reputation goes up
Besides a web download, we can also provide a Linked Data interface, SPARQL endpoint,
Lookup (autocomplete) or many other means of availability (like AWS or Docker images)
Any distribution we are doing will funnel feedback and collaboration opportunities your
way to improve your dataset and your internal data quality
You will receive an enriched dataset, which is connected and complemented with any other
available data (see the same folder names in data and fusion folders).
Data Sellers
If you are selling data, the databus provides numerous opportunities for you. You can link
your offering to the open entities in the databus. This allows consumers to discover your
services better by showing it with each request.
Data Consumers
Open data on the databus will be a commodity. We are greatly downing the cost for
understanding the data, retrieving and reformatting it. We are constantly extending ways
of using the data and are willing to implement any formats and APIs you need.
If you are lacking a certain kind of data, we can also scout for it and load it onto the
databus.
How the Databus works at the moment
We are still in an initial state, but we already load 10 datasets (6 from DBpedia, 4
external) on the bus using these phases:
Acquisition: data is downloaded from the source and logged in
Conversion: data is converted to N-Triples and cleaned (Syntax parsing, datatype
validation and SHACL)
Mapping: the vocabulary is mapped on the DBpedia Ontology and converted (We have been
doing this for Wikipedia’s Infoboxes and Wikidata, but now we do it for other datasets as
well)
Linking: Links are mainly collected from the sources, cleaned and enriched
IDying: All entities found are given a new Databus ID for tracking
Clustering: ID’s are merged onto clusters using one of the Databus ID’s as cluster
representative
Data Comparison: Each dataset is compared with all other datasets. We have an algorithm
that decides on the best value, but the main goal here is transparency, i.e. to see which
data value was chosen and how it compares to the other sources.
A main knowledge graph fused from all the sources, i.e. a transparent aggregate
For each source, we are producing a local fused version called the “Databus Complement”.
This is a major feedback mechanism for all data providers, where they can see what data
they are missing, what data differs in other sources and what links are available for
their IDs.
You can compare all data via a webservice (early prototype, just works for Eiffel Tower):
http://88.99.242.78:9000/?s=http%3A%2F%2Fid.dbpedia.org%2Fglobal%2F12HpzV&a…
We aim for a real-time system, but at the moment we are doing a monthly cycle.
Is it free?
Maintaining the Databus is a lot of work and servers incurring a high cost. As a rule of
thumb, we are providing everything for free that we can afford to provide for free.
DBpedia was providing everything for free in the past, but this is not a healthy model, as
we can neither maintain quality properly, nor grow.
On the Databus everything is provided “As is” without any guarantees or warranty.
Improvements can be done by the volunteer community. The DBpedia Association will provide
a business interface to allow guarantees, major improvements, stable maintenance and
hosting.
License
Final databases are licensed under ODC-By. This covers our work on recomposition of data.
Each fact is individually licensed, e.g. Wikipedia abstracts are CC-BY-SA, some are
CC-BY-NC, some are copyrighted. This means that data is available for research,
informational and educational purposes. We recommend to contact us for any professional
use of the data (clearing), so we can guarantee that legal matters are handled correctly.
Otherwise professional use is at own risk.
Current Stats
Download
The databus data is available at
http://downloads.dbpedia.org/databus/[http://downloads.dbpedia.org/databus/…
ordered into three main folders:
Data: the data that is loaded on the databus at the moment
Global: a folder that contains provenance data and the mappings to the new IDs
Fusion: the output of the databus
Most notably you can find:
Provenance mapping of the new ids in
global/persistence-core/cluster-iri-provenance-ntriples/[http://downloads.d…
and
global/persistence-core/global-ids-ntriples/[http://downloads.dbpedia.org/d…
The final fused version for the core:
fusion/core/fused/[http://downloads.dbpedia.org/databus/fusion/core/fused/[…
A detailed JSON-LD file for data comparison:
fusion/core/json/[http://downloads.dbpedia.org/databus/fusion/core/json/[ht…
Complements, i.e. the enriched Dutch DBpedia Version:
fusion/core/nl.dbpedia.org/[http://downloads.dbpedia.org/databus/fusion/cor…
(Note that the file and folder structure are still subject to change)
Sources
Glue
Source
Target
Amount
de.dbpedia.org[http://de.dbpedia.org/[http://de.dbpedia.org/]]www.viaf.org[…
387,106
diffbot.com[http://diffbot.com/[http://diffbot.com/]]www.wikidata.org[http:…
516,493
d-nb.info[http://d-nb.info/[http://d-nb.info/]]
viaf.org[http://viaf.org/[http://viaf.org/]]
5,382,783
d-nb.info[http://d-nb.info/[http://d-nb.info/]]
dbpedia.org[http://dbpedia.org/[http://dbpedia.org/]]
80,497
d-nb.info[http://d-nb.info/[http://d-nb.info/]]
sws.geonames.org[http://sws.geonames.org/[http://sws.geonames.org/]]
50,966
fr.dbpedia.org[http://fr.dbpedia.org/[http://fr.dbpedia.org/]]www.viaf.org[…
266
sws.geonames.org[http://sws.geonames.org/[http://sws.geonames.org/]]
dbpedia.org[http://dbpedia.org/[http://dbpedia.org/]]
545,815
kb.nl[http://kb.nl/[http://kb.nl/]]
viaf.org[http://viaf.org/[http://viaf.org/]]
2,607,255
kb.nl[http://kb.nl/[http://kb.nl/]]www.wikidata.org[http://www.wikidata.org…
121,012
kb.nl[http://kb.nl/[http://kb.nl/]]
dbpedia.org[http://dbpedia.org/[http://dbpedia.org/]]
37,676
www.wikidata.org[http://www.wikidata.org][http://www.wikidata.org/[http://w…
5,133
wikidata.dbpedia.org[http://wikidata.dbpedia.org/[http://wikidata.dbpedia.o…
45,344,233
wikidata.dbpedia.org[http://wikidata.dbpedia.org/[http://wikidata.dbpedia.o…
sws.geonames.org[http://sws.geonames.org/[http://sws.geonames.org/]]
3,495,358
wikidata.dbpedia.org[http://wikidata.dbpedia.org/[http://wikidata.dbpedia.o…
viaf.org[http://viaf.org/[http://viaf.org/]]
1,179,550
wikidata.dbpedia.org[http://wikidata.dbpedia.org/[http://wikidata.dbpedia.o…
d-nb.info[http://d-nb.info/[http://d-nb.info/]]
601,665
Plan for the next releases
Include more existing data from DBpedia
Renew all DBpedia releases in a separate fashion:
DBpedia Wikidata is running already:
http://78.46.100.7/wikidata/[http://78.46.100.7/wikidata/][http://78.46.100…
Basic extractors like infobox properties and mapping will be active soon
Text extraction will take a while
Load all data in the comparison tool:
http://88.99.242.78:9000/?s=http%3A%2F%2Fid.dbpedia.org%2Fglobal%2F12HpzV&a…
Load all data into a SPARQL endpoint
Create a simple open source software that let’s everybody push data on the databus in an
automated way
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--
All the best,
Sebastian Hellmann
Director of Knowledge Integration and Linked Data Technologies (KILT) Competence Center
at the Institute for Applied Informatics (InfAI) at Leipzig University
Executive Director of the DBpedia Association
Projects:
http://dbpedia.org[http://dbpedia.org],
http://nlp2rdf.org[http://nlp2rdf.org],
http://linguistics.okfn.org[http://linguistics.okfn.org],
https://www.w3.org/community/ld4lt[http://www.w3.org/community/ld4lt]
Homepage:
http://aksw.org/SebastianHellmann[http://aksw.org/SebastianHellmann]
Research Group:
http://aksw.org[http://aksw.org]