DOCBOOK-APPS: how to change the displayed style of <lineannotation>?

currently, in a <screen> element, anything i put in a
<lineannotation> element is displayed in regular, courier font.
what's the easiest way to have that italic, times roman
instead?  

  is there a specific XSL stylesheet directive for doing this,
or should i go through the CSS decoration?  and am i making any
sense for this early in the morning?

rday