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>
  <sidebar>
    <sidebar>
      <Navigation>
        <n-mainpage text="Hauptseite" href="/wiki/Hauptseite" id="n-mainpage" active="" />
        <n-.C3.9Cber-Lobbypedia text="Über Lobbypedia" href="/wiki/%C3%9Cber_Lobbypedia" id="n-.C3.9Cber-Lobbypedia" active="" />
        <n-Inhalt-A-Z text="Inhalt A-Z" href="/wiki/Inhalt_A-Z" id="n-Inhalt-A-Z" active="" />
        <n-Artikel-nach-Kategorien text="Artikel nach Kategorien" href="/wiki/Kategoriesystem" id="n-Artikel-nach-Kategorien" active="" />
        <n-FAQ text="FAQ" href="/wiki/FAQ" id="n-FAQ" active="" />
      </Navigation>
      <Vernetzen>
        <n-Facebook.7CFacebookIcon_24px.png text="Facebook|FacebookIcon_24px.png" href="https://www.facebook.com/lobbycontrol" id="n-Facebook.7CFacebookIcon_24px.png" active="" rel="nofollow" target="_blank" />
        <n-Twitter.7CTwitterIcon_24px.png text="Twitter|TwitterIcon_24px.png" href="https://twitter.com/lobbycontrol" id="n-Twitter.7CTwitterIcon_24px.png" active="" rel="nofollow" target="_blank" />
        <n-Youtube.7CYouTubeIcon_24px.png text="Youtube|YouTubeIcon_24px.png" href="https://www.youtube.com/user/lobbycontrol" id="n-Youtube.7CYouTubeIcon_24px.png" active="" rel="nofollow" target="_blank" />
        <n-Newsletter.7CLobbycontrolIcon_24px.png text="Newsletter|LobbycontrolIcon_24px.png" href="https://www.lobbycontrol.de/newsletter-lobbypedia" id="n-Newsletter.7CLobbycontrolIcon_24px.png" active="" rel="nofollow" target="_blank" />
      </Vernetzen>
      <Mitmachen>
        <n-recentchanges text="Letzte Änderungen" href="/wiki/Spezial:Letzte_%C3%84nderungen" id="n-recentchanges" active="" />
        <n-Fehler-melden text="Fehler melden" href="/wiki/Fehler_melden" id="n-Fehler-melden" active="" />
        <n-Spenden text="Spenden" href="/wiki/Spenden" id="n-Spenden" active="" />
        <n-F.C3.B6rdermitglied-werden text="Fördermitglied werden" href="/wiki/Lobbypedia:F%C3%B6rdermitglied" id="n-F.C3.B6rdermitglied-werden" active="" />
      </Mitmachen>
    </sidebar>
  </sidebar>
</api>