Backpage feed class is used to generate the feed xml for backpage. I have hosted the backpage feed class in github public repository.

Example Back page feed

<?xml version="1.0" encoding="ISO-8859-1"?>
<rss version="2.0"
xmlns:backpage="http://www.backpage.com/rss/2.0">
<channel>
<backpage:import user="YourEmail@Address.com" site="http://www.backpage.com" />
<item>
<backpage:site>http://losangeles.backpage.com</backpage:site>
<backpage:id>2420811</backpage:id>
<backpage:since>2012-04-20+01:20</backpage:since>
<backpage:category>RestaurantRetailJobs</backpage:category>
<backpage:SourceUrl>http://YourDomain.com/jobs/waiter12.html</backpage:SourceUrl>
<backpage:replyEmail>YourEmail@Address.com</backpage:replyEmail>
<backpage:allowReplies>No</backpage:allowReplies>
<backpage:region>Los Angeles</backpage:region>
<backpage:country>United States</backpage:country>
<title> Server Positions Available at Super Good Restaurant</title>
<description>
<![CDATA[Super Good Restaurant Restaurant, located at 27th Street is now accepting applications
for friendly, energetic, highly motivated individuals who will thrive in a fast-paced, team-
oriented environment. We are currently seeking professional, sophisticated servers.
<br><br>
*Competitive compensation: ($75-100 lunch; $100-150 dinner) consistently
<br>
*Full Health Benefits available upon hire
<br><br>
Please apply in person Monday through Friday between 3-4 pm. (27th and Park) Application will be
followed by an interview with a manager, so please dress accordingly.
<br><br>
<a href="http://www.YourCompanyDomain.com
" target="_blank"> http://www.YourCompanyDomain.com </a> ]]>
</description>
</item>
</channel>
</rss>