Is this field required to be populated?
Can this field have null values?
The initial value of a field, or a function which assigns that initial value.
A data validation function which accepts one argument with the current value.
A localizable label displayed on forms which render this field.
Localizable help text displayed on forms which render this field.
A custom validation error string. When displayed will be prepended with the document name, field name, and candidate value.