The Nice Classification consists of a classification of goods and services for the purposes of registering trademarks and service marks. The authentic bilingual versions of the Nice Classification include Class Headings accompanied by Explanatory Notes and a Bilingual (English-French and French-English) Alphabetical List of Goods and Services. The Class Headings describe in very broad terms the nature of the goods or services contained in each of the 34 classes of goods and 11 classes of services. They are accompanied, where appropriate, by Explanatory Notes which describe in greater detail the type of goods or services included in the classes concerned. The Bilingual Alphabetical List comprises around 10,100 indications of goods and 1,500 services edited in English or French, with the equivalent indication in the other language and the number of the class to which each good or service belongs. In order to keep the Nice Classification up to date, it is continuously revised and a new edition is published every five years. The tenth edition entered into force on January 1, 2012.