OR Condition

I’ve been reading through the guides and there is a lot to take in, but have to say that this plugin is going to save me a lot of effort.

I was just wondering if there was an OR condition as well? I read about AND, NOT and ELSE, but didn’t see anything about OR.

I’ve got a basic condition:

[is author]
   // Another Shortcode Here
[/is]

And in addition to “is author”, I want to add:
– OR “is admin”
– OR “has capability xyz”

How would I know how to do the above mentioned conditions, just not how to string them together.