The Access to Biological Collections Data (ABCD) schema is a highly structured data exchange and access model for taxon occurrence data (specimens, observations, etc. of living organisms), i.e. primary biodiversity data.
In 2006, an 'Extension For Geosciences' was added to the schema, to form the ABCDEFG Schema, and in 2010, Biodiversity Information Standards (TDWG) published a draft standard extension for DNA, called ABCDDNA.
- "EFG Schema" (PDF). Archived from the original (PDF) on April 2, 2012. Retrieved 8 September 2011.
- "ABCDDNA : DNA extension for Access to Biological Collection Data". Biodiversity Information Standards (TDWG). Retrieved 30 August 2013.
- https://web.archive.org/web/20070929124618/http://www.wfcc.nig.ac.jp/NEWSLETTER/newsletter36/a6.pdf the ABCD database schema