Handling multi-line SocketFactory input?

I'm wondering, what's the best way in POE to handle a multi-line 
protocol, essentially I have input that looks like this, which is 
handled in my code by a ReadWrite session spawned from a 
Wheel::SocketFactory connection:
CMD- arg1 arg2 ...
  ... arbitrary number of lines here ...
CMD END

My question is, what's the best way to collect the multiple lines before 
parsing?  I'm thinking an arrayref in the ReadWrite session, that 
parses/flushes once I hit the END line ... I could certainly make 
something like that work with my limited POE knowledge, but maybe 
there's a more better ... or innate-to-POE way of handling this type of 
situation?
Thanks,
-john