meta 2 0 http://www.openmath.org/cdfiles/cdgroups/meta.cdg Meta CD Group This is the first version of the Core CD group. It was created by D Carlisle based on MathML CD Group. Constructs for building CDs meta http://www.openmath.org/cd/meta.ocd Constructs for building CD Signatures metasig http://www.openmath.org/cd/metasig.ocd Constructs for building CD Groups metagrp http://www.openmath.org/cd/metagrp.ocd