Markup for application features

Hi,

I'm searching an adequate markup for the features of a program. Eg. in 
the context of a text editor I would like to markup "Spell Checking" or 
"Line Wrapping". I thought of something like <application 
class="feature">Spell Checking</application>, the attribute role is too 
weak in my eyes, but the attribute class is already reserved for 
hardware and software. So is there any better solution?

Thanks,
Georges