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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20151127170315" timestamp="2015-11-27T17:03:15Z" ns="0" title="Settaggio del modello" />
        <page value="20151202170727" timestamp="2015-12-02T17:07:27Z" ns="0" title="Opzioni di modellazione fisica e numerica del codice" />
        <page value="20160114134732" timestamp="2016-01-14T13:47:32Z" ns="0" title="Generazione delle maglie di calcolo" />
        <page value="20160210073234" timestamp="2016-02-10T07:32:34Z" ns="0" title="Ifort" />
        <page value="20160210134123" timestamp="2016-02-10T13:41:23Z" ns="0" title="Mpich" />
        <page value="20160210134303" timestamp="2016-02-10T13:43:03Z" ns="0" title="Slib" />
        <page value="20160210141409" timestamp="2016-02-10T14:14:09Z" ns="0" title="Zlib" />
        <page value="20160210141626" timestamp="2016-02-10T14:16:26Z" ns="0" title="Szip" />
        <page value="20160211170308" timestamp="2016-02-11T17:03:08Z" ns="0" title="Hdf5" />
        <page value="20160211172002" timestamp="2016-02-11T17:20:02Z" ns="0" title="Netcdf per c" />
      </results>
    </querypage>
  </query>
</api>