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>
    <pages>
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      <page pageid="68" ns="0" title="AMX" contentmodel="wikitext" pagelanguage="en" touched="2015-03-13T11:28:32Z" lastrevid="4031" counter="21288" length="7820" />
      <page pageid="534" ns="0" title="AV &amp; Custom Systems" contentmodel="wikitext" pagelanguage="en" touched="2015-03-13T11:23:52Z" lastrevid="4026" counter="22945" length="3142" />
      <page pageid="563" ns="0" title="Global Cache: Receiving States of Sensors and System Data" contentmodel="wikitext" pagelanguage="en" touched="2013-12-03T08:30:17Z" lastrevid="3165" counter="3233" length="1867" />
      <page pageid="613" ns="0" title="Global Cache: Working with RS232 Devices" contentmodel="wikitext" pagelanguage="en" touched="2013-12-03T08:30:37Z" lastrevid="3167" counter="4298" length="4599" />
      <page pageid="633" ns="0" title="AV &amp; Custom Systems: Working with Equipment via TCP" contentmodel="wikitext" pagelanguage="en" touched="2013-12-03T08:30:50Z" lastrevid="3168" counter="3666" length="3986" />
      <page pageid="634" ns="0" title="AV &amp; Custom Systems: Working with Equipment via UDP" contentmodel="wikitext" pagelanguage="en" touched="2013-12-03T08:31:11Z" lastrevid="3170" counter="2900" length="3780" />
      <page pageid="695" ns="0" title="AV &amp; Custom Systems: Working with Equipment via HTTP" contentmodel="wikitext" pagelanguage="en" touched="2013-12-03T08:31:21Z" lastrevid="3171" counter="4096" length="3198" />
      <page pageid="1007" ns="0" title="SIP Telephony" contentmodel="wikitext" pagelanguage="en" touched="2015-09-03T08:59:59Z" lastrevid="4078" counter="18388" length="4903" />
      <page pageid="1247" ns="0" title="Global Cache" contentmodel="wikitext" pagelanguage="en" touched="2015-03-13T11:24:16Z" lastrevid="4027" counter="9281" length="3379" />
    </pages>
  </query>
</api>