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>
    <general mainpage="Αρχική σελίδα" base="http://www.gaiapedia.gr/gaiapedia/index.php/%CE%91%CF%81%CF%87%CE%B9%CE%BA%CE%AE_%CF%83%CE%B5%CE%BB%CE%AF%CE%B4%CE%B1" sitename="GAIApedia" logo="/gaiapedia/skins/common/images/Glogo.png" generator="MediaWiki 1.22.6" phpversion="5.4.45" phpsapi="apache2handler" dbtype="mysql" dbversion="5.5.63-MariaDB" imagewhitelistenabled="" langconversion="" titleconversion="" linkprefix="" linktrail="/^([a-zαβγδεζηθικλμνξοπρστυφχψωςΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩάέήίόύώϊϋΐΰΆΈΉΊΌΎΏΪΫ]+)(.*)$/sDu" git-hash="b4bf12355db4105a380428e2bd19b3b4ae2b33cd" case="first-letter" rights="" lang="el" fallback8bitEncoding="iso-8859-7" writeapi="" timezone="UTC" timeoffset="0" articlepath="/gaiapedia/index.php/$1" scriptpath="/gaiapedia" script="/gaiapedia/index.php" variantarticlepath="" server="http://www.gaiapedia.gr" wikiid="gaiapedia_db" time="2024-05-17T14:12:49Z" maxuploadsize="104857600">
      <externalimages>
        <prefix>http://172.31.129.41/</prefix>
      </externalimages>
      <fallback>
        <lang code="en" />
      </fallback>
    </general>
    <namespaces>
      <ns id="-2" case="first-letter" canonical="Media" xml:space="preserve">Μέσο</ns>
      <ns id="-1" case="first-letter" canonical="Special" xml:space="preserve">Ειδικό</ns>
      <ns id="0" case="first-letter" content="" xml:space="preserve" />
      <ns id="1" case="first-letter" subpages="" canonical="Talk" xml:space="preserve">Συζήτηση</ns>
      <ns id="2" case="first-letter" subpages="" canonical="User" xml:space="preserve">Χρήστης</ns>
      <ns id="3" case="first-letter" subpages="" canonical="User talk" xml:space="preserve">Συζήτηση χρήστη</ns>
      <ns id="4" case="first-letter" subpages="" canonical="Project" xml:space="preserve">GAIApedia</ns>
      <ns id="5" case="first-letter" subpages="" canonical="Project talk" xml:space="preserve">Συζήτηση GAIApedia</ns>
      <ns id="6" case="first-letter" canonical="File" xml:space="preserve">Αρχείο</ns>
      <ns id="7" case="first-letter" subpages="" canonical="File talk" xml:space="preserve">Συζήτηση αρχείου</ns>
      <ns id="8" case="first-letter" subpages="" canonical="MediaWiki" xml:space="preserve">MediaWiki</ns>
      <ns id="9" case="first-letter" subpages="" canonical="MediaWiki talk" xml:space="preserve">Συζήτηση MediaWiki</ns>
      <ns id="10" case="first-letter" canonical="Template" xml:space="preserve">Πρότυπο</ns>
      <ns id="11" case="first-letter" subpages="" canonical="Template talk" xml:space="preserve">Συζήτηση προτύπου</ns>
      <ns id="12" case="first-letter" subpages="" canonical="Help" xml:space="preserve">Βοήθεια</ns>
      <ns id="13" case="first-letter" subpages="" canonical="Help talk" xml:space="preserve">Συζήτηση βοήθειας</ns>
      <ns id="14" case="first-letter" canonical="Category" xml:space="preserve">Κατηγορία</ns>
      <ns id="15" case="first-letter" subpages="" canonical="Category talk" xml:space="preserve">Συζήτηση κατηγορίας</ns>
      <ns id="102" case="first-letter" canonical="Property" xml:space="preserve">Property</ns>
      <ns id="103" case="first-letter" subpages="" canonical="Property talk" xml:space="preserve">Property talk</ns>
      <ns id="104" case="first-letter" canonical="Type" xml:space="preserve">Type</ns>
      <ns id="105" case="first-letter" subpages="" canonical="Type talk" xml:space="preserve">Type talk</ns>
      <ns id="106" case="first-letter" canonical="Form" xml:space="preserve">Φόρμα</ns>
      <ns id="107" case="first-letter" subpages="" canonical="Form talk" xml:space="preserve">Συζήτηση φόρμας</ns>
      <ns id="108" case="first-letter" canonical="Concept" xml:space="preserve">Concept</ns>
      <ns id="109" case="first-letter" canonical="Concept talk" xml:space="preserve">Concept talk</ns>
      <ns id="420" case="first-letter" canonical="Layer" xml:space="preserve">Layer</ns>
      <ns id="421" case="first-letter" canonical="Layer talk" xml:space="preserve">Layer talk</ns>
    </namespaces>
    <namespacealiases>
      <ns id="6" xml:space="preserve">Image</ns>
      <ns id="7" xml:space="preserve">Image talk</ns>
    </namespacealiases>
    <statistics pages="20143" articles="9585" views="57252310" edits="65535" images="3932" users="20" activeusers="3" admins="11" jobs="0" />
  </query>
</api>