How to add a mapping namespace

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As an example, we use the fictitious language Xxyzish with Wikipedia domain xx and Wikipedia rank 44.

CAUTION: several subtle code changes will be needed to accomodate language codes that contain a dash (e.g. roa-rup or be-x-old), especially in regard to URLs, file names and other identifiers, also in parts of the code base not listed here. In this case, please update the code and this guide.

Get language code and rank

Get the wiki language code and rank from the list of Wikipedias.

Namespace number: multiply the rank by 2 and add 200

Example: language code "xx", rank 44, namespace number 288.

CAUTION: If the calculated namespace number already exists for another language (because the ranking has changed) do not change the existing namespace number. Please find a neighboring or close enough number that works.

Example: If 288 is in use, we choose some other number that is not used, let's say 298.

CAUTION: Do not use namespace numbers >= 400. Namespaces 400 and above are used by MediaWiki. Please find a number between 200 and 398 that is not yet used.

Example: If the language rank is 100, the formula above would yield namespace number 400. Instead, we choose some other number that is not used, let's say 398.

Update mappings wiki

Update MediaWiki settings

Log onto the machine that is running this mappings wiki, i.e. serving URLs.

Open LocalSettings.php. Add the following snippet in the correct alphabetical position in the map defining the extra namespaces:


Restart the Apache server.

Add the mappings main page

Edit The page content should be the following, where Xxyzish is the English name of the language:

{{Mapping main page|xx|Xxyzish}}

Update mappings wiki sidebar

Edit MediaWiki:Sidebar. Add a link for the new language in the correct alphabetical position:

** Mapping xx|Mappings (xx)

Update datasets overview

Edit DBpedia datasets. Add a column for the new language in the correct alphabetical position and update all rows according to the settings in dump/ This is probably the most tedious part...

Update the extraction framework

Edit Namespace.scala

Edit your copy of core/src/main/scala/org/dbpedia/extraction/wikiparser/Namespace.scala. Add something like this in the correct alphabetical position:



Edit your copy of dump/ Add something like this in the correct alphabetical position:


You can add more extractors, but make sure that the required configuration exists for the new language.

Update namespace settings for mappings wiki

To update the namespace settings for the mappings wiki, cd to core/ and run

../clean-install-run generate-settings

Commit changes

Commit and push the changes to default branch.

Update and restart the mapping server

Log onto the machine that is running the mapping server, i.e. serving URLs.

Stop the server:

sudo /etc/init.d/dbpedia-server stop

Or, if there's no start/stop script:

ps axfu | grep java

Look for class ...server.Server, and then:

kill <process id>

Add a dummy file extraction_framework/server/src/main/statistics/mappingstats_xx.txt with the following content (make sure there are two empty lines at the end!):




Then update and compile the server:

cd extraction_framework
git pull
mvn clean install --projects core,server

Finally, start the server:

sudo /etc/init.d/dbpedia-server start

Or, if there's no start/stop script:

cd extraction_framework/server
../run server &>server-<YYYY>-<MM>-<DD>.01.log &

Generate and deploy statistics

Extract data from Wikipedia dump file

Download the latest dump for language xx. see here for details

dump> ../run download config={download-config-file}

Run RedirectExtractor, InfoboxExtractor and TemplateParameterExtractor. dump/ should already contain the correct settings. cd into directory dump/ and execute

dump> ../run stats-extraction

Extract statistics from triples files

cd into directory server/, modify the path to the dump base dir in pom.xml if necessary and run

server> ../run stats

Copy src/main/statistics/mappingstatistics_xx.txt to same folder on the mappings server.

Update and deploy sprint stuff

Ask Pablo how to do that...