In the plantuml source code (src/net/sourceforge/plantuml/core/DiagramType.java) I found a number of possible start commands:
startwire
startbpm
startuml
startdot
startditaa
startsalt
startmath
startlatex
startgantt
startmindmap
startwbs
startyaml
startcreole
startjson
startflow
startcute
startproject
starttree
startboard
startgit
startjcckit
startnwdiag
startdef
For the first set (startwire ...startflow) I found one or more examples and could run these successfully with plantuml (version: 1.2021.4beta4).
For the other commands I could not find a direct example.
For the starttree command I saw an example by means of startuml + salt like:
@startuml
salt
{
{T
- World
}
}
@enduml
though no direct example using @starttree.
Similar for nwdiag with
@startuml
nwdiag {
...
Even worse when trying some of the @start... plantuml crashed with a java.lang.IllegalStateException
Where can I find some examples for the "non-working" @start... commands?