[xml2rfc] <sourcecode> inside an <aside>

[Roger Price <[e-mail]>]

I would like to place a short piece of code in an aside, but this is not 
allowed by the content model for <aside>:

  element aside {,,,, (artset|artwork|blockquote|dl|figure|iref|ol|t|table|ul)* }

It is forbidden to write

  <aside><t>Bla bla ....</t>
  <sourcecode>a=a+1</sourcecode></aside>

I find I have to write

  <aside><t>Bla bla ....</t>
  <figure><sourcecode>a=a+1</sourcecode></figure></aside>

This puts the a=a+1 into the aside, but gives me an unwanted "Figure n".

1. Is there a neater way of doing this?
2. Why not allow <sourcecode> in the content model for <aside>?

Roger