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>
    <search>
      <p ns="0" title="Styl kodowania i standardy" snippet="Private class members (&lt;span class=&#039;searchmatch&#039;&gt;meaning&lt;/span&gt; class members that are intented to be used only from within the same class &#10;" size="20260" wordcount="2943" timestamp="2013-12-05T22:42:30Z" />
      <p ns="0" title="Modyfikacja - Sekcja: Lista kategorii, Kategoria - Przegląd artykułów w Joomla 1.5" snippet="&amp;lt;blockquote&amp;gt;&#039;&#039;Note: The following is a &amp;quot;core hack&amp;quot;, &lt;span class=&#039;searchmatch&#039;&gt;meaning&lt;/span&gt; that one of the Joomla! core files is modified. This means that this file c&#10;" size="11869" wordcount="1915" timestamp="2009-09-15T22:54:31Z" />
      <p ns="0" title="Weryfikacja praw dostępu" snippet="== &lt;span class=&#039;searchmatch&#039;&gt;Meaning&lt;/span&gt; of the numbers ==&#10;" size="5034" wordcount="771" timestamp="2013-12-09T03:20:56Z" />
    </search>
  </query>
</api>