Yoast/wordpress-seo — pull request #1513 by stevenwoodson (2014-08-29 03:35:52+00:00)
Title: Update class-sitemaps.php

Allows developers the ability to apply the filter called 'wpseo_sitemap_output' to modify any of the generated output. Useful in cases where permalinks need to be changed sitemap-wide as wpseo_xml_sitemap_img_src only works on images.