Which operations should result in the value being computed.
AQL RETURN expression that computes the value.
Whether the write operation should fail if the expression produces a warning.
If set to false, the field will be unset if the expression evaluates to
null. Otherwise the field will be set to the value null. Has no effect
if overwrite is set to false.
Name of the target attribute of the computed value.
If set to false, the computed value will not be applied if the
expression evaluates to null.
Properties defining a computed value.