Value constraint types with no value constraints

Because the value constraint type is intended to provide a context for interpreting a value constraint, a value constraint type means nothing in the absence of a value constraint. If a value is provided for valueConstraintType but not for valueConstraint, a warning will be emitted.

propertyID	valueConstraintType
:securityLevel	picklist

is interpreted as:

DCTAP instance
    Shape
        shapeID                  default
        Statement Template
            propertyID           :securityLevel
            valueConstraintType  picklist

WARNING [default/valueConstraint] Value constraint type ('picklist') but no value constraint.