There was a previous question - "when importing taxonomy terms, can one use the Taxonomy Name, or must it be the Taxonomy ID". The question about feeds was answered, but not if a Term Name can be used for mapping.
[I have around 4 000 products to be imported with over 100 individual terms for faceted searches. It will be easier to clean up the data using the taxonomy name. If I can map on the Term Name, it will save a step converting the name to a TID.]