Page desribing BPs for data packages about soil carbon. it will probably have links out for details.
Jones, Matthew, Margaret O’Brien, Bryce Mecum, Carl Boettiger, Mark Schildhauer, Mitchell Maier, Timothy Whiteaker, Stevan Earl, and Steven Chong. 2019. “Ecological Metadata Language Version 2.2.0.” https://doi.org/10.5063/f11834t2.