Volume title tag

Hi,

I'm looking for a tag to store the title of the volume in which an
article is published.

Say I have an article, published under: 2004, Volume 14, General Contributions.

I've got:

 <articleinfo>
  ...
  <volumenum>14</volumenum>
  <edition>2004</edition>
  ...
 </articleinfo>

But what would I store "General Contributions" under?

Kind regards,
Aidan