Contains values that specify the validation rule result type (error, warning or information).
An error dialog is displayed when a rule is broken. A user must modify data in order to fix the error and proceed.
A warning dialog is displayed a rule is broken. A user can ignore this warning and proceed.
No dialog is displayed when a rule is broken. Instead, an information glyph appears near the rule's target property in UI. Broken rule details are available in this glyph's tooltip.