Clarification about Alt-Svc

Howdy,

I'd like to clarify that if a server would like to advertise two alternate
services with different expirations, it would do so with something like:

    Alt-Svc: h2=":80"; ma=3600, h2="new.example.org:80"; ma=3600

Am I reading that correctly? Section 3 specifies:

    Alt-Svc       = 1#( alternative *( OWS ";" OWS parameter ) )

But I'm not confident that I understand what "1#" means in that line.

Cheers,

Ryan