Below code is from URDF course
<param name="robot_description" command="$(find xacro)/xacro '$(find my_robot_description)/robots/myrobot.urdf.xacro'" />
Here we have the extension
myrobot.urdf.xacro', i see that there are two dots here, one between myrobot and urdf and the other between urdf and xacro. The dot between urdf and xacro seems straightforward. I want to know if the dot between myrobot and urdf has any significance or is it treated as part of the filename?