is this how i ask a question?

[Artur F <schirmcharmemelone AT googlemail.com>]

Hello,

i am using graphStream to work on an ant colony optimization algorithm and want to delete nodes after a specific time. I am using the dgs file format and did find this site here:  http://graphstream-project.org/doc/Advanced-Concepts/The-DGS-File-Format/

and as it seems right now what i want is the

"st" event, but i do not know how to use it.

i tried to use it like this:

st 100
dn "0_0"

seems like the st line will just be ignored.

then i tried this:

st 100 dn "0_0"

which makes everything crash with a null pointer exception.

what is the correct way to use the "st" step command?