Rules to validate any property. Some properties have specific rules additionally to these.
Is this field required
Customize the required message when the property is not set
If the unique flag is set to
true, you can only have one entity in the
collection with this value.
If the uniqueInArray flag is set to
true, you can only have this value
once per entry in the parent
ArrayProperty. It has no effect if this
property is not a child of an
ArrayProperty. It works on direct
children of an
ArrayProperty or first level children of