class ValueType implements
    Externalizable {

    public boolean isNumber() {
        return ( this.simpleType == SimpleValueType.INTEGER ||
                 this.simpleType == SimpleValueType.DECIMAL ||
                 this.simpleType == SimpleValueType.CHAR || 
                 this.simpleType == SimpleValueType.NUMBER ) ;
    }

    public  ValueType();
    private  ValueType(final String name,
                      final Class<T> classType,
                      final int simpleType);

}