Passing command line argument between multiple launch-files

edit

I'm using a launch file master.launch that includes global_config.launch. In master.launch I define a command line argument using

<arg name="config_argument" />

and then I include global_config.launch

<include file="$(find package_name)/launch/global_config.launch" />

But I will need the argument to be available in global_config.launch. Is it possible pass the argument from the master.launch to the global_config.launch?

Thanks to gvdhoorn for linking that question. I changed my launchfiles as follows:
master.launch

  <arg name="rosbag_name" />  
  <include file="$(find neuromorphic_stereo)/launch/global_config.launch">  
    <arg name="rosbag_name" value="$(arg rosbag_name)" />  
  </include>

global_config.launch

<node pkg="rosbag" type="play" name="event_publisher" args="$(find neuromorphic_stereo)/rosbag_simulator/$(arg rosbag_name)_merged.bag" required="true" />

but now ros tells me

unused args [rosbag_name] for include of global_config.launch

even though I'm actually using it. What am I still doing wrong?