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>
    <allimages aicontinue="NonMotorized_HBW1.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="BWI_Accessibility.jpg" timestamp="2014-02-20T15:42:39Z" url="http://www.mstm.org/images/c/c3/BWI_Accessibility.jpg" descriptionurl="http://www.mstm.org/index.php/File:BWI_Accessibility.jpg" ns="6" title="File:BWI Accessibility.jpg" />
      <img name="Case1_TOD.jpg" timestamp="2014-02-20T16:28:10Z" url="http://www.mstm.org/images/0/02/Case1_TOD.jpg" descriptionurl="http://www.mstm.org/index.php/File:Case1_TOD.jpg" ns="6" title="File:Case1 TOD.jpg" />
      <img name="Case2_Amazon.jpg" timestamp="2014-02-20T16:28:28Z" url="http://www.mstm.org/images/0/07/Case2_Amazon.jpg" descriptionurl="http://www.mstm.org/index.php/File:Case2_Amazon.jpg" ns="6" title="File:Case2 Amazon.jpg" />
      <img name="Case3_CSX.jpg" timestamp="2014-02-20T16:57:18Z" url="http://www.mstm.org/images/2/23/Case3_CSX.jpg" descriptionurl="http://www.mstm.org/index.php/File:Case3_CSX.jpg" ns="6" title="File:Case3 CSX.jpg" />
      <img name="Case4_ArundelMills.jpg" timestamp="2014-02-20T17:02:33Z" url="http://www.mstm.org/images/c/c9/Case4_ArundelMills.jpg" descriptionurl="http://www.mstm.org/index.php/File:Case4_ArundelMills.jpg" ns="6" title="File:Case4 ArundelMills.jpg" />
      <img name="Case5_MultiModal.jpg" timestamp="2014-02-20T17:02:46Z" url="http://www.mstm.org/images/d/d6/Case5_MultiModal.jpg" descriptionurl="http://www.mstm.org/index.php/File:Case5_MultiModal.jpg" ns="6" title="File:Case5 MultiModal.jpg" />
      <img name="FAF_Processing.jpg" timestamp="2014-02-21T18:40:46Z" url="http://www.mstm.org/images/7/79/FAF_Processing.jpg" descriptionurl="http://www.mstm.org/index.php/File:FAF_Processing.jpg" ns="6" title="File:FAF Processing.jpg" />
      <img name="Job_Accessibility.jpg" timestamp="2014-02-20T15:34:17Z" url="http://www.mstm.org/images/9/91/Job_Accessibility.jpg" descriptionurl="http://www.mstm.org/index.php/File:Job_Accessibility.jpg" ns="6" title="File:Job Accessibility.jpg" />
      <img name="MC_Validation.jpg" timestamp="2014-02-14T15:46:46Z" url="http://www.mstm.org/images/2/2a/MC_Validation.jpg" descriptionurl="http://www.mstm.org/index.php/File:MC_Validation.jpg" ns="6" title="File:MC Validation.jpg" />
      <img name="MSTM_Overview.jpg" timestamp="2014-02-06T20:53:50Z" url="http://www.mstm.org/images/a/af/MSTM_Overview.jpg" descriptionurl="http://www.mstm.org/index.php/File:MSTM_Overview.jpg" ns="6" title="File:MSTM Overview.jpg" />
    </allimages>
  </query>
</api>