Thank you for this interesting reply!
I actually would also have a question about this topic. I apologise in advance for my english!
I'm trying to import a CSV file through the CSVImport Module, and using a Resource template. I'm working for the National Institute of Art in Paris, and our csv files are very complex. For example, we use many dc:description fields with alternative labels to personalize our bibliographic labels. Thus, I was thinking to do the same thing in Omeka S: multiplying Description properties and use alternative labels and comments. But when I try to add an second or third Description property, it refuses to appear.
Is it because we are not supposed to do so? Or is there another reason and then a solution behind this problem? I tried an import with a resource template personalized (with other properties coming for other ontologies) and all my fields were empty then...
Btw, I'm working with the version 1.0.0-beta2. Could that be the reason why?
I'm sorry for the novel and I thank you in advance if you can help me!