The condition is Lisp's general-purpose, and dare I say elegant, way of handling errors and other out-of-band ... things. Here's a good description. Conditions and events might end up being the same thing in Decl. We'll see.
Oh, that's right - here was the "Conditions for non-Lispers" article that got me thinking in this direction this month, along with a 2003 post by Ovid on the Monks about exception handling in Perl specifically. Perl is essentially not capable of implementing Lisp-like conditions, or at least not without a lot of very ugly boilerplate. But Decl would be. Maybe even (under certain circumstances) within embedded Perl.
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