Recommendation:
A comma-separated list of documentation DOIs should be used in the references attribute in Earth Science data products, both globally and for specific variables.
Recommendation Details:
The references attribute is useful for storing information regarding documentation in Earth Science data products. The references attribute can exist both globally and at variable level. The most concise way to reference a document is via its DOI. Comma-separated lists are easier to parse than space-separated lists. It follows that a comma-separated list of documentation DOIs should be used in the references attribute in Earth Science data products.
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