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LinkedWiki-Mediawiki Extension

From /oooooooooo.io/


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

And if I want to add this wiki's triplestorage SPARQL-endpoing, as a default option to Special:SparqlQuery

I to follow the LinkedWiki configuraion instruction[1], and add to the wiki's LocalSettings.php

 
$wgLinkedWikiConfigSPARQLServices["http://sparql.oooooooooo.io/wiki/query"] = array(
        "isReadOnly" => true,
        "typeRDFDatabase" => "fuseki",
        "endpointRead" => "http://sparql.oooooooooo.io/wiki/query",
        "HTTPMethodForRead" => "POST"
);
$wgLinkedWikiSPARQLServiceByDefault="http://sparql.oooooooooo.io/wiki/query";

Test SPARQL query this wiki triplestorage

And we can make a Test SPARQL query against the Triple storage, SPARQL endpoint of this wiki http://sparql.oooooooooo.io/wiki/query, using Special:SparqlQuery. Asking what subjects(pages) have the property foaf:homepage and what are their values.


PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT * WHERE 
 { ?page foaf:homepage ?value . } 
LIMIT 15

And we can also embed the query onto a wiki page, with


{{#sparql:
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT * WHERE 
 { ?page foaf:homepage ?value . } 
LIMIT 15
|config=http://sparql.oooooooooo.io/wiki/query
|chart=bordercloud.visualization.DataTable
|options=width=50%!height=500px
|log=2
}}
Code_Notes +
Date"Date" is a type and predefined property provided by Semantic MediaWiki to represent date values.
2020 +