Since 1848, the Swiss federal government publishes legal instruments in 3 national languages (German, French, Italian) and in 3 principal publications: the <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Federal Gazette</hi>, a weekly report of the Federal Council and law drafts proposed to the Federal Assembly, the legally binding <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Official Compilation</hi> (OC), a record of actual changes to the federal law in chronological order, updated every week; finally the trimestral <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Systematic compilation</hi>, in thematic order and representing the current state of federal law. Texts are partitioned in structural units (chapters, sections, articles, paragraphs, sentences and enumeration items) unequivocally identified by a reference code ( e.g. SR 313.0, art. 29, §1, al. a) equivalent for all language versions. Working with the OC allows us to observe the chronological development of law on a weekly basis.