creating a message.xml file for resets and messages

im having problems setting up a .xml or even understanding a .xml file

i want to have a server reset every 2 hour 30mins

and 10 server messages

is this correct for server resets

<message>

<deadline>150</deadline>

<shutdown>1</shutdown>

<text>This server (#name) will shutdown in #tmin minutes.</text>

</message>

also would this reset after every reset or do i need to add more?

and how would i delay server messages to every 15 mins thank you so much