While I cannot answer this specific question, there is a website created “Oral History in the Digital Age” (http://ohda.matrix.msu.edu/). I did a quick search and came back with a few results. There is a contact link and it might be worth contacting the creators of this site and see what kind of response you get back. I searched “Tagging” and came back with some results that might help you find and answer. I hope this helps and sorry I could not provide you with more.