[plt-scheme] scheme/class: mixins and overriding/augmenting

Hi all,

I've got a bunch of classes with "render" methods, some of which are overridable and some of which are augmentable.

I'd like to create a mixing that overrides *or* augments these methods depending on the context. Is there a way to determine whether a method is augmentable or overridable and do the appropriate thing?

Cheers,

-- Dave