Indicating recipients of a document?

[Stephane Bortzmeyer <bortzmeyer@nic.fr>]

I'm authoring a Docbook document and I indicate myself as <author>. My
supervisor would like to have the recipients of the document (another
division, who requested this report) indicated. I find no:

<recipient role="customer">
   <person>
     ...

element. Did I miss something? Is it a case for a little local
customization of the Docbook schema?