[mrglsmrc]

there's a simpler way. you don't need a script.
If the application that you are working with is written in cocoa framework of apple, as most good mac apps are, then you should use the append to omnioutliner feature in the services submenu of the menubar of the active window.
did you remember to install omniservices in your application support folder of your user library? :)

ps the keyboard shortcut to append to omnioutliner is "command >"

it is called "omnioutliner: add to clippings"

just test it out.