How to reference a value in an XML file

Hey guys!  I have a valid XML structure, and in it is the following info:

<app>
     <settings>
          <setting name="defaultModuleSlug" value="apples"></setting>
          <setting name="defaultPageSlug" value="oranges"></setting>
     </settings>
<app>

The XML info is in an application object called application.config.

So, How do I reference the defaultPageSlug variable?  I know I can use:

application.config[ 'app' ][ 'settings' ].xmlChildren[ 2 ].xmlAttribute[ 'value' ]

However, I'd like to be able to reference the setting by it's name attribute (defaultPageSlug) and not assuming it's the 2nd element in that node.  Can someone help?