He's saying that this is explained in the EJB 3.0 specification, which is developed under JSR 220 (JSR = Java Specification Request). Google for "jsr 220"; the first link that comes up is where you can download the specification. It's a good idea to keep the spec handy while you learn EJB.
Paper jam tastes about as you would expect. Try some on this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop