Sets 1 0 http://www.openmath.org/cdfiles/cdgroups/sets.cdg Cds which describe operations on sets and their names CD to describe operations on sets set1 http://www.openmath.org/cd/set1.ocd CD to describe further operations on sets set2 http://www.openmath.org/cd/set2.ocd CD to describe sets which are compliant with MathML setname1 http://www.openmath.org/cd/setname1.ocd CD to describe some common mathematical sets setname2 http://www.openmath.org/cd/setname2.ocd