acid1c,
The metadata that I refer to is captured in the column info data. So for instance using your mixture example that you shared the three screen shots indicate the metadata that is captured in the column information. This is captured during the design setup phase. However if you just bring in data from an Excel file or another design package you would need to specify the metadata in the column info in order to have the correct coding etc.
9314_Screen Shot 2015-07-26 at 11.19.21 AM.png
9315_Screen Shot 2015-07-26 at 11.19.29 AM.png
9316_Screen Shot 2015-07-26 at 11.19.38 AM.png