You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages aicontinue="Inputpackets.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Boards.jpg" timestamp="2013-04-05T07:19:02Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Boards.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Boards.jpg" ns="6" title="File:Boards.jpg" />
      <img name="Carte_mere_v1.2_tiny.jpg" timestamp="2015-09-16T08:58:59Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Carte_mere_v1.2_tiny.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Carte_mere_v1.2_tiny.jpg" ns="6" title="File:Carte mere v1.2 tiny.jpg" />
      <img name="Cycl5_tiny.jpg" timestamp="2015-09-15T09:14:30Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Cycl5_tiny.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Cycl5_tiny.jpg" ns="6" title="File:Cycl5 tiny.jpg" />
      <img name="CycloneIIIv22_sm.jpg" timestamp="2013-04-08T00:00:46Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/CycloneIIIv22_sm.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:CycloneIIIv22_sm.jpg" ns="6" title="File:CycloneIIIv22 sm.jpg" />
      <img name="CycloneIIIv24_sm.jpg" timestamp="2013-04-07T23:24:44Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/CycloneIIIv24_sm.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:CycloneIIIv24_sm.jpg" ns="6" title="File:CycloneIIIv24 sm.jpg" />
      <img name="Ex1_logout.jpg" timestamp="2013-04-08T01:42:01Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Ex1_logout.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Ex1_logout.jpg" ns="6" title="File:Ex1 logout.jpg" />
      <img name="Ex1_scriptin.jpg" timestamp="2013-04-08T01:41:45Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Ex1_scriptin.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Ex1_scriptin.jpg" ns="6" title="File:Ex1 scriptin.jpg" />
      <img name="Fusionv20.jpg" timestamp="2013-04-05T22:35:20Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Fusionv20.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Fusionv20.jpg" ns="6" title="File:Fusionv20.jpg" />
      <img name="Fusionv20_sm.jpg" timestamp="2013-04-08T00:02:32Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Fusionv20_sm.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Fusionv20_sm.jpg" ns="6" title="File:Fusionv20 sm.jpg" />
      <img name="Hardware.jpg" timestamp="2013-04-04T19:54:18Z" url="https://labh-curien.univ-st-etienne.fr/wiki-evariste/img_auth.php/Hardware.jpg" descriptionurl="https://labh-curien.univ-st-etienne.fr/wiki-evariste/index.php/File:Hardware.jpg" ns="6" title="File:Hardware.jpg" />
    </allimages>
  </query>
</api>