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>
    <allpages gapcontinue="Repair_Hammer" />
  </query-continue>
  <query>
    <pages>
      <page pageid="58" ns="0" title="Red Zombie">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">{{Entity
|Name=Red Zombie
|Image=RedZombie.png
}}

'''Red Zombies''' are hostile mobs.

Red zombies has more chance spawning in [[Maple Forest|maple forest]] than other biomes. Unlike [[Green Zombie|green zombie]], they move faster but have lower health point.</rev>
        </revisions>
      </page>
      <page pageid="302" ns="0" title="Reeds">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">{{BlockBox
|Name=Reeds
|Image=Reeds_150.png
|ImageList=[[File:Reeds.png]]
}}

'''Reeds''' are a type of grass grows in [[Wetland|wetland]].</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>