This file is indexed.

/usr/share/sdformat/1.4/mesh_shape.sdf is in sdformat-sdf 2.0.0-6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<element name="mesh" required="0">
  <description>Mesh shape</description>
  <element name="uri" type="string" default="__default__" required="1">
    <description>Mesh uri</description>
  </element>

  <element name="submesh" required="0">
    <description>Use a named submesh. The submesh must exist in the mesh specified by the uri</description>
    <element name="name" type="string" default="__default__" required="1">
      <description>Name of the submesh within the parent mesh</description>
    </element>
    <element name="center" type="bool" default="false" required="0">
      <description>Set to true to center the vertices of the submesh at 0,0,0. This will effectively remove any transformations on the submesh before the poses from parent links and models are applied.</description>
    </element>
  </element> <!-- End submesh -->

  <element name="scale" type="vector3" default="1 1 1" required="0">
    <description>Scaling factor applied to the mesh</description>
  </element>
</element>