In NLP Centre, dividing text into sentences is currently done with a tool which uses rule-based system. In order to make enough training data for machine learning, annotators manually split the corpus of contemporary text CBB.blog (1 million tokens) into sentences. Each file contains one hundredth of the whole corpus and all data were processed in parallel by two annotators.

The corpus was created from ten contemporary blogs: hintzu.otaku.cz modnipeklo.cz bloc.cz aleneprokopova.blogspot.com blog.aktualne.cz fuchsova.blog.onaidnes.cz havlik.blog.idnes.cz blog.aktualne.centrum.cz klusak.blogspot.cz myego.cz/welldone