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>
    <blocks>
      <block id="53" user="Anonymous" by="Anonymous" timestamp="2017-04-03T20:36:55Z" expiry="infinity" reason="eigener Wunsch" nocreate="" autoblock="" />
      <block id="52" user="MadgeVHFndmcn" by="Jens Rusch" timestamp="2014-11-30T16:55:04Z" expiry="infinity" reason="Ungeeigneter Benutzername" nocreate="" autoblock="" />
      <block id="50" user="Alw" by="Jens Rusch" timestamp="2014-11-30T16:54:27Z" expiry="infinity" reason="Ungeeigneter Benutzername" nocreate="" autoblock="" />
      <block id="48" user="HollieRoderick" by="Jens Rusch" timestamp="2014-11-30T16:53:08Z" expiry="infinity" reason="Ungeeigneter Benutzername" nocreate="" autoblock="" />
      <block id="46" user="Thunderboy19" by="Jens Rusch" timestamp="2014-11-30T16:52:18Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="45" user="Edw9j5u5ra" by="Jens Rusch" timestamp="2012-10-16T06:56:33Z" expiry="infinity" reason="Einstellen unsinniger Seiten" nocreate="" autoblock="" />
      <block id="43" user="AllainPease739" by="Jens Rusch" timestamp="2012-10-15T17:19:54Z" expiry="infinity" reason="Einstellen unsinniger Seiten" nocreate="" autoblock="" noemail="" />
      <block id="41" user="Mara4djwtr" by="Jens Rusch" timestamp="2012-10-13T15:24:56Z" expiry="infinity" reason="Einstellen unsinniger Seiten" nocreate="" autoblock="" />
      <block id="39" user="Hmecxidw" by="Jens Rusch" timestamp="2012-10-12T10:54:04Z" expiry="infinity" reason="Einstellen unsinniger Seiten" nocreate="" autoblock="" noemail="" />
      <block id="37" user="SouthwickPritchett167" by="Jens Rusch" timestamp="2012-10-12T10:53:38Z" expiry="infinity" reason="Einstellen unsinniger Seiten" nocreate="" autoblock="" noemail="" />
    </blocks>
  </query>
  <query-continue>
    <blocks bkstart="2012-08-09T15:56:24Z" />
  </query-continue>
</api>