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>
  <compare fromrevid="1" torevid="2" xml:space="preserve">&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange&quot;&gt;&amp;lt;strong&amp;gt;MediaWiki has been successfully installed.&amp;lt;/strong&amp;gt;&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Consult &lt;/del&gt;the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;[//meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;== Verifying Automatically &lt;/ins&gt;the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Correct Use and Implementation of Container Libraries ==&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-context'&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;== Getting started ==&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;The growing need for automated services in our fast-going society demands for in- creasingly complex software artifacts&lt;/ins&gt;. &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;To tackle this complexity, most programming languages offer Application Programming Interfaces (API) allowing software developers to use abstract data structures (sets, maps, stacks, queues, etc&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;), known as containers&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;* [//www&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;mediawiki&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;* [//www&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;This project aims at defining scalable program analyses based on modular views of programs, at two levels of abstraction&lt;/ins&gt;: &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;(1) a high level view, in which data containers are black boxes, handled via abstract specification contracts, and (2) a low level view of the implementation of containers as recursive data structures&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;* [https&lt;/del&gt;:&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;//lists&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td class='diff-deletedline'&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;* [//www&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;mediawiki&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td class='diff-addedline'&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;We plan to develop (a) decision procedures for logics able to describe complex data structures, (b) verification tools based on model checking and static analysis, and (c) techniques for automatic generation of refinement relations between specifications and implementations&lt;/ins&gt;. &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;We plan to carry out experiments on industrial test cases&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
</compare>
</api>