The second edition of the WRB is a system to classify soils. Soon after its publication,
there was an identified demand to create map legends using the WRB. For this
purpose, the ‘Guidelines for constructing small-scale map legends using the WRB’
were published in 2010 http://www.fao.org/nr/land/soils/soil/wrb-documents/en/.
They were recommended for map scales of 1 : 250 000 or smaller. The version for
classifying soils (2006/07) and the version for creating map legends (2010) are based on
the same definitions, but use different qualifier sequences and different rules for using
the qualifiers (see below).