The Access to Biological Collections Data (ABCD) Schema is an evolving comprehensive standard for the access to and exchange of data about specimens and observations (a.k.a. primary biodiversity data).
More info
Acronym: 

ABCD

Organization (owner / creator): 

Taxonomic Databases Working Group (TDWG)

URL for more info: 

http://www.tdwg.org/standards/115/

Contact email: 

A.Rissone(at)nhm.ac.uk