[xsl] tokenizing comma separated string with quotes

["Andrew Welch" <andrew.j.welch@xxxxxxxxx>]

Given the input

<elem>"foo, bar", baz, bom</elem>

Is there a nice one liner  / technique to return the three tokens
"foo, bar"  "baz" "bom"

eg:

<root>
 <token>foo, bar</token>
 <token>baz</token>
 <token>bom</token>
</root>

I can't see the answer for all the apparent quote escaping required...