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="Reporting_Flow" />
  </query-continue>
  <query>
    <pages>
      <page pageid="909" ns="0" title="Receive Task">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">{{DISPLAYTITLE:Receive Task}}{{#lead-mw-content: XbpmnNotations|getPageContent|{{FULLPAGENAME}} }}

=== Reference Content ===
*Business Process Reference Content
*Performance Model Reference Content
*Measurement Reference Content
*Process Architecture Reference Content
*IT Process Map Reference Content
*Rule Modelling Reference Content
*Change Management Reference Content
*Optimization Reference Content
*Effectiveness Reference Content
*Efficiency Reference Content
*Re-engineering Reference Content
*Transformation Benchmarking Reference Content
*Innovation Reference Content[[Category:Objects Inner]]</rev>
        </revisions>
      </page>
      <page pageid="999" ns="0" title="Report">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">{{#lead-mw-content: MetaObjectDescriptions|getPageContent|{{FULLPAGENAME}} }}

=== Reference Content ===
*[[Enterprise_Standards:Strategy_Management_Reference_Content|Strategy Management Reference Content]]
*[[Enterprise_Standards:Growth%3A_Core_Differentiating_%26_Core_Competitive_Reference_Content|Growth: Core Differentiating &amp; Core Competitive Reference Content]]
*[[Enterprise_Standards:Performance_Management_Reference_Content|Performance Management Reference Content]]
*[[Enterprise_Standards:Planning_Management_Reference_Content|Planning Management Reference Content]]
*[[Enterprise_Standards:Production_Management_Reference_Content|Production Management Reference Content]]
*[[Enterprise_Standards:Portfolio_Management_Reference_Content|Portfolio Management Reference Content]][[Category:Objects Inner]]</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>