How do URIs work?

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1

Hi , i was teaching myself XML in SDF to better work with Gazebo.(Though the Syntax might seems different compared to URDF which we are used to, they are pretty much the same.)

Question:

<uri>model://sun</uri>

Can someone tell me how URIs, in general works? Is this a hyperlink to a page on the internet or is it a folder on a directory on the local computer?

<?xml version="1.0" ?>
<sdf version="1.5">
  <world name="default">

    <!-- A global light source -->
    <include>
      <uri>model://sun</uri>
    </include>

    <!-- A ground plane -->
    <include>
      <uri>model://ground_plane</uri>
    </include>
  </world>
</sdf>
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