Porta Historica is a European network of research institutes which, in one way or another, are responsible for producing editions of historical texts. It currently has five members, the École Nationale des Chartes, the Institute of Netherlands History, the Commission Royale d’Histoire/Koninklijke Commissie voor Geschiedenis, the Institut für Mittelalterforschung and the Institute of Historical Research. Increasingly, editions are being published in digital form, and the concept of an edition in this context is evolving. In order to help historians formulate their approaches to the production of digital editions, and to assist them in evaluating those which are already available online, Porta Historica has produced a set of guidelines for editors and digital resource creators. These are available on the Porta Historica website, http://www.portahistorica.eu/editions, in four languages – English, French, Spanish and German.
