The schema key; per-file CollectionItem.values reference it.
OptionalnameThe displayed column header (/N). Defaults to key when omitted.
OptionalsubtypeThe column data type (/Subtype). Defaults to "text".
OptionalorderThe relative ordering (/O); columns are shown in ascending order.
Optionalvisible/V — whether the column is initially visible (default true).
One column of a portfolio schema (a
/CollectionField).