RPSL and Cisco Conditional Advertisement

["Howard C. Berkowitz" <hcb () clark net>]

One of those questions, I'm afraid, that could go to an assortment of lists.

Has anyone defined an RPSL construct that can express the semantics 
of Cisco BGP conditional advertisement?  I can see how to express 
"static" relationships, but not dynamic ones among routes, and an 
action clause doesn't quite fit.

TIA,

Howard