<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/SearchAction>
<http://www.codingforums.com/php/282828-xml-feed-into-php-mysql-listings-site-noob-question-s.html?s=b77623a309f1e00370ec9b1d22428403>