new 'conformsTo' projects object to better track the use of data standards

[rebeccawilliams]

This is something the federal government is exploring and would be useful! It could be incorporated w/ CfA's larger body of work on standards.

[ondrae]

Super interesting. We'd be happy to have the CfAPI work cleanly with other efforts. I'll be doing most of these improvements in Nov / December.

I'd also be interested in having a field that links to a dataset that the project is using.