RSS Import Permitted Tags

I’m trying to move a blog from Joomla to WordPress, as over the years I’ve come to prefer it and want use it for all my sites. I’ve managed to rebuild 1,200 pages using the RSS import function and it’s looking good.

One question though is, what tags can be used when importing RSS? Other than the standard ones <category>, <title> etc?

For example can i drop post tags in? and a post thumbnail URL?

I can’t seem to find a list of allowed tags anywhere.

Thanks,
n

http://codex.wordpress.org/Importing_Content