emphasis within quoted text

[Kerry Cox <kerryjcox@gmail.com>]

Wondering if there is a tag or option that will allow me to emphasize
a portion of text with a <screen/> or <programlisting/> section?
Or is there some related tag that would highlight quoted text and
allowed a small blurb to be italicized or emphasized?
I have been looking through the DocBook page and checking all
available tags. Have not yet found a comparable example. I am
attempting to cite a small portion of code and then emphasize a
particular aspect as an example.
Thanks.
KJ