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You can do this now in ROS Kinetic using eval:

<arg name="arg_name" default="desired_value"/>

<node pkg="node_pkg" type="node_type" name="node_name" if="$(eval arg_name == 'desired_value')"/>

The documentation has been updated: http://wiki.ros.org/roslaunch/XML

You can do this now in ROS Kinetic using eval:

<arg name="arg_name" default="desired_value"/>

<node pkg="node_pkg" type="node_type" name="node_name"  if="$(eval arg_name == 'desired_value')"/>

The documentation has been updated: http://wiki.ros.org/roslaunch/XML

You can do this now in ROS Kinetic using eval:

<arg name="arg_name" default="desired_value"/>

<node pkg="node_pkg" type="node_type" name="node_name" 
      if="$(eval arg_name arg('arg_name') == 'desired_value')"/>

The documentation has been updated: http://wiki.ros.org/roslaunch/XML