How can I have multiple fields with the same taxonomy on Drupal's node creation form?

My designers want to u开发者_如何学Pythonse the same taxonomy for three different purposes. On the node creation form we'd have three different fields where you're choosing from the same set of terms. Ideally, one field would enforce a single choice (and be hierarchical), and the others would allow multiple choices with tags. Any thoughts about how to accomplish this?

I would use the CCK module with the Content Taxonomy module to add taxonomy fields to a custom content type used by the nodes. Relevant links:

http://drupal.org/project/cck and http://drupal.org/project/content_taxonomy