public NodePortDefinition(string key, string title, InputOutputType inputOutputType, IPortData defaultValue, bool isMandatory)
 {
     Key             = key;
     Title           = title;
     InputOutputType = inputOutputType;
     DataMode        = DataMode.WithData;
     PortDataType    = defaultValue.GetType();
     DefaultValue    = defaultValue;
     Mandatory       = isMandatory;
 }