LinkedWiki-Mediawiki Extension

• Extension Link: https://www.mediawiki.org/wiki/Extension:LinkedWiki

The LinkedWiki extension lets you reuse Linked Data in your wiki. You can get data from Wikidata or another source directly with a SPARQL query. This extension also provides Lua functions for building your modules so that you can write your data in your RDF database.

installation

You will need to install yarn , I have followed the instructions in https://classic.yarnpkg.com/en/docs/install/#debian-stable which as I have problems with the yarn packed from the Debian Stable apt source.

cd extensions
git clone https://github.com/wikimedia/mediawiki-extensions-LinkedWiki.git LinkedWiki
cd LinkedWiki

Install composer (locally). I prefer not to have composer installed system wide, so I will install it in the LinkedData extension dir.

curl -sS https://getcomposer.org/installer | php

Run composer install, to install the dependencies

php composer.phar install --no-dev

And finally run yarn install:

yarn install --production=true

Load the extension in LocalSettings.php, by adding to it:

wfLoadExtension( 'LinkedWiki' );

Check the installation by going to Special:Interwiki and Special:LinkedWikiConfig pages, note that the extension does not appear in Special:Version.

If not installed, you are need to install php-curl, :

sudo apt-get install php-curl

And restart the webserver:

sudo systemctl restart apache2

Test

And we can make a Test SPARQL query against Wikidata in Special:SparqlQuery, with the following query, which asks for the European capitals with a population of the more that 1 million, which can be seen embedded in the wiki page LinkedWiki-Sandbox

SELECT DISTINCT ?country ?countryName ?capital ?capitalName ?capitalPop 
WHERE
        {
            ?country wdt:P31 wd:Q6256 . 
            ?country rdfs:label ?countryName . 
                FILTER (LANG(?countryName) = "en").
            ?country wdt:P30 wd:Q46 .  
            ?country wdt:P36 ?capital .
            ?capital rdfs:label ?capitalName .
                FILTER (LANG(?capitalName) = "en")
            ?capital wdt:P1082 ?pop . 
                FILTER ( abs(?pop) > 1000000)
                BIND(round(?pop) as ?capitalPop ) 
        }               
ORDER BY DESC(?capitalPop) 
LIMIT 20

Setting up & Config

As administrator I have to add myself to the group "Data" in Special:UserRights in order to write on the LinkedWiki created namespaces: Data and UserData

I like to add the LinkedWiki important pages to the side bar so i add to Mediawiki:Sidebar

* LinkedWiki
** Special:LinkedWikiConfig|LinkedWikiConfig
** Special:SparqlQuery|SparqlQuery