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.
- "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". 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