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>
    <allpages apcontinue="HMS._05.12.065-05.12.074_(Release_of_30.05.2019)" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="348" ns="0" title="ChangeLog" />
      <p pageid="936" ns="0" title="Configuring interacrion between HMS Servio and Site" />
      <p pageid="931" ns="0" title="Consolidated bills rules" />
      <p pageid="879" ns="0" title="Corporate Module" />
      <p pageid="893" ns="0" title="Corporate Module/Пошаговая инструкция по заполнению карты гостя" />
      <p pageid="910" ns="0" title="Fees and charges 2019" />
      <p pageid="786" ns="0" title="HMS. 05.12.033 — 05.12.039 (Релиз от 24.09.2018)" />
      <p pageid="788" ns="0" title="HMS. 05.12.040 — 05.12.048 (Релиз от 21.11.2018)" />
      <p pageid="787" ns="0" title="HMS. 05.12.040 — 05.12.049 (Релиз от 21.11.2018)" />
      <p pageid="869" ns="0" title="HMS. 05.12.050 — 05.12.064 (Релиз от 14.03.2019)" />
    </allpages>
  </query>
</api>