Semantic MediaWiki and Wikidata
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The goal of Wikidata is to create a common data repository (something similar to Wikimedia Commons) where data can be shared among other Wikimedia projects and by/with third parties.
Differences between SMW and Wikidata
The main use case of Wikidata (a centralised, multi-lingual site that serves as a data repository) is different from that of SMW (a data-enhanced MediaWiki), and this leads to a number of differences.
Central to a wikidata statement is that its factual claim is supported by reference(s) (source of the claim). For example, when SMW makes a claim about the population of Berlin it would only be annotated with Berlin has a population of 3,5 Mio (see Figure 1) where Wikidata would make an extended statement describing it as Berlin's population being 3,5 Mio as of 2011 according to the German statistical office (see Figure 2).
As of Semantic MediaWiki 2.5.0Released on 14 March 2017 and compatible with MW 1.23.0 - 1.29.x. there is a datatype "Reference"Holds a value that associates it to individual defined provenance metadata record that allows to record individual defined provenance metadata.
- In summary
- Every fact will also have an (optional) reference
- Wikidata will also use more complex datatypes (e.g., since many text values can be translated).
- Both Wikidata and SMW are still mostly based on property-value assignments, and Wikidata will have a Property namespace.
- Complex structures in Wikidata could be captured in SMW using subobjects
Common denominators of SMW and Wikidata
Integration between SMW and Wikidata
For a first example, see Service links and the page for Vienna with the Property:Wikidata ID. It demonstrates, how Service links or External identifiers can be used to link values of a SMW property to Wikidata IDs.
The software underlying Wikidata is called Wikibase. It consists of two extensions: Repository (where data is stored; this will run at wikidata.org) and Client (that pulls data into other MediaWiki sites; this will run at wikipedia.org). Both extensions will be installable on MediaWiki sites to get Wikidata-like features there.
The user interface of Wikibase Repository will be based on input forms, a bit like a full-page, editable Factbox, but much more advanced, with a lot of support for entering values.
Ideas for a integration of SMW and Wikibase/Wikidata
- Push data from SMW to a Wikibase instance (as it would be done wich any other triple store)
- Push data from SMW to Wikidata.
- Import ontolgies from Wikidata to SMW instances
- Consuming data from Wikidata in your SMW instance. There are several approaches:
- get the data via SPARQL using the extension Linked Wiki
- get the data via JSON using the extension External Data
- get the data via JSON and accessing data based on the property Wikidata ID using the extension WikidataShow
Talks and presentations
A total of 16 contributions were made to concerning Semantic MediaWiki and Wikidata:
|Wikidata Synchronization for the CEUR-WS publishing platform use case||Data synchronization between Wikidata and SMW on the CEUR-WS use case.||Tim Holzheim||wikidata||Lightning talk,|
|Linked Data with SMW||The next SMW release will include schema.org and other vocabularies ready for re-use. The tutorial will cover aspects of linking to external data sources, re-using external vocabularies, and providing identifiers to be used to link to your own wiki.||Bernhard Krabina||import vocabulary,|
datatype external identifier
|What's new in the world of Wikibase and where is it going?||An overview of what's new around Wikibase and the plans we have for the Wikibase Ecosystem.||Lydia Pintscher,|
|Linked Data with SMW (Tutorial)||How to use external vocabularies (e. g. FOAF) and reference to external idenifiers (e. g. Wikidata ID) with SMW.||Bernhard Krabina||Wikidata,|
|Wikidata Walkabout: a drill-down interface for Wikidata||Yaron Koren||Wikidata||Talk|
|Four years of Wikidata - where we are, what we learned and what's coming next||This presentation will provide an insight into the past four years of Wikidata and the upcoming future.||Lydia Pintscher||wikidata,|
|Semantic MediaWiki for Assessment in Education||Lloyd Rutledge||wikidata,|
|From graphs to tables||The case for storing semantic data in tables instead of, or in addition to, graphs - for SMW/Cargo, Wikidata, and beyond||Yaron Koren||Cargo,|
|SMW between OpenData, OpenGLAM, Linked Data and the Semantic Web||Overview of the Semantic MediaWiki ecosystem, it's todays relevance in relation to OpenData, WikiData, OpenGLAM and the Semantic Web.||Bernhard Krabina||open data,|
|Wikibase, the Software behind Wikidata||Last year, Wikidata, the project that brings structured data to Wikipedia, was presented at SMWCon. This talk is all about Wikibase, the software behind Wikidata.||Jeroen De Dauw||Wikidata,|
|Using the Wikidata API||An introduction to the Wikidata API||Daniel Kinzler,|
|BlueForge Feature Matrix: WikiData - An experience report||This talk covers the experience made with Wikidata by "Hallo Welt! Medienwerkstatt GmbH". It's about why we chose it and what were the difficulties we had to deal with.||Markus Glaser,|
|State of Wikidata||A quick look at what Wikidata has achieved so far and where it is going||Lydia Pintscher||Wikidata||Talk|
|Hands-on session 3. Wikidata programming||A tutorial showing you how to use Wikidata to enrich data in your wiki||Daniel Kinzler,|
|Breaking News Detection with Wikidata and Wikipedia||This talk informs about the work of incorporating Wikidata in "Wikipedia Live Monitor" tool.||Thomas Steiner||breaking news detection,|
|Wikidata||Wikidata: Semantic Wikipedia||Denny Vrandečić||Wikidata||Keynote|