<launch> tag
The <launch> tag is the root element of any roslaunch file. Its sole purpose is to act as a container for the other elements.
Attributes
- deprecated="deprecation message" - ROS 1.1: warn users that roslaunch file is deprecated. 
 
Elements
- Launch a node.
 - Set a parameter on the Parameter Server 
 - Declare a name remapping.
 - Declare a machine to use for launching.
 - Set ROS parameters for the launch using a rosparam file. 
 - Include other roslaunch files. 
 - Specify an environment variable for launched nodes.
 - Launch a test node (see rostest). 
 - Declare an argument.
 - Group enclosed elements sharing a namespace or remap.
 
