How to add a mapping namespace

As an example, we use a fictitious language with code "xx" and Wikipedia rank 44.

CAUTION: some subtle code changes will be needed for the first language code that contains a dash "-". 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.

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

Update the extraction framework

Edit core/org.dbpedia.extraction.wikiparser.Namespace.scala

Edit core/org.dbpedia.extraction.wikiparser.Namespace.scala. Add something like this at the appropriate position:

"xx"->288,

Edit dump/extract.default.properties

Edit dump/extract.default.properties. Add something like this at the appropriate position:

extractors.xx=MappingExtractor

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

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 http://mappings.dbpedia.org/server/ URLs.

Stop the server:

ps axfu | grep java

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

kill <process id>

Then update, compile and start the server:

cd extraction_framework
hg pull
hg update
mvn clean install --projects core,server
cd server
../run server &>server-<YYYY>-<MM>-<DD>.01.log &

Update mappings wiki

Update MediaWiki settings

Log onto the machine that is running this mappings wiki, i.e. serving http://mappings.dbpedia.org/index.php URLs.

Open htdocs/mappings/LocalSettings.php. Add the following snippet at the correct position in the code:

"xx"=>288,

Restart the Apache server.

Update mappings wiki sidebar

Edit MediaWiki:Sidebar. Add a link for the new language:

** {{fullurl:Special:AllPages|namespace=288}}|Mappings (xx)

Update datasets overview

Edit datasets. Add a column for the new language and update all rows according to the settings in dump/extract.default.properties. Ouch...

Generate and deploy statistics

Extract data from Wikipedia dump file

Download the latest dump for language xx.

Run RedirectExtractor, InfoboxExtractor and TemplateParameterExtractor. dump/extract.stats.properties should contain the correct settings. cd into directory dump/, copy extract.stats.properties to extract.properties, modify if necessary, and run

dump> ../run extract

Extract statistics from triples files

cd into directory server/ 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...