scale tag in uwsim

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Hello,

I want to use scale tag for my mesh file in urdf that is loaded in uwsim, i tried like standard urdf in mesh tag, but it doen't work, also tried with inside collision tag that i got parsing error. anybody knows how it is possible to scaling mesh files in urdf for uwsim? Also is it possible to use xacro in uwsim or not? Thanks in advance.

my urdf:

<?xml version="1.0"?>
<robot name="visual">
<link name="base_link">
    <visual>
      <geometry>
         <!--   <cylinder length="0.6" radius="0.2"/> -->
         <!--   <mesh filename="robot/cube_20k.stl" scale="4 4 4"/> -->
          <mesh filename="robot/ARM5E/ARM5E_part0.osg" scale="6 6 6"/>
     </geometry>
</robot>