validationState enumeration
An integer indicating the validation state, or whether the operation can or cannot be done.
The validationState enumeration has the following constants of type unsigned short.
VAL_TRUE = 5
True if the node is valid with regards to the operation, or if the operation can be done.
VAL_FALSE = 6
False if the node is invalid with regards to the operation, or if the operation cannot be done.
VAL_UNKNOWN = 7
The validity of the node is unknown.