In 1995 the Commission developed its own defining the relevant types of geographical features, specific elements of geographical names, inappropriate names, criteria of names approval, language and spelling, and names approval procedures. In particular, the Guidelines introduced the Streamlined System that was subsequently adopted as the official national system for the Romanization of Bulgarian, eventually becoming part of Bulgarian law by way of the 2009 , and endorsed also by UN in 2012 and by the USA and UK in 2013.