For example:

If

something

Then

another

Else

something else

The problem with else is that it is hard to define what you mean by else. As put by Ernest Friedman (author of Jess):

+Nope, doesn't work that way, because there are several different kinds

of "not true" that might apply (facts don't exist; facts exist but

fields don't match; etc.) You have to write a separate rule for the

"else" condition.+

So the best bet is to express what you really mean as multiple rules.