The KIM infrastructure embraces a subset of EDN as a standard data format. EDN stands for extensible data notation, and is pronounced like the word "eden".
The primary purpose of this data format choice is to serve as a notational superset to JSON with the enhancements being that it (1) allows for comments and (2) treats commas as whitespace enabling easier templating.
The subset of EDN allowed is constrained to:
nullwhich is not allowed. Instead consider (1) using an empty string (
"") as the value, (2) using the number
0as the value, (3) or omitting a key-value pair.