I like the following better: column name | generalized type | validation rule | hidden? -------------------------------------------------------

I like the following better: column name | generalized type | validation rule | hidden? ------------------------------------------------------------------ first_name | text | name_regex | false last_name | text | name_regex | false middle_name | text | name_regex | false birth_date | date | over_18 | false location | [double,double] | undefined | true addresses | | has_many | false Parsing it into JSON-equivalent is a programming exercise you can give your interviewees. (my point is that data format doesn't matter - JSON, YAML, XML, |'s and -'s are just different "colors" giving semantic meaning to your data: but it's what you can do with that data which is important)