[no_protocol]

The writing in here looks pretty clean. My one suggestion would be to get some more examples in there. Most of the descriptions are one line and as a total outsider I just wanted to see some in action.

This document is much more appealing to me than the project's README. Since people often browse just the README when visiting a repository on GitHub, I wonder if you would be better off getting some of the language from sections 1 and 2 into the top of your README. The current README Overview just didn't do it for me. As soon as I saw the first two sections of the user manual, I was more interested because it showed what problem you were solving and how.

> Warning - This manual may reflect a future state of szl.

Got a chuckle out of me.