Generates the data files for ViziData.
This program uses Wikidata-Toolkit (0.7.0). If you set it up as a Maven project it will pull it's dependencies automatically. See here for wdtk information and setup instructions.
There have been efforts to reduce memory usage of this programm but you will need to increase your JVM heap size. Consider a minimum of roughly +500MB per extracted DataSet. If you can afford, give an extra GB to reduce garbage collection load. (e.g. -Xmx3072 for extracting 4 Datasets).