Add filter, please…

It would be nice to have a filter in render() function from sitemap.core.php

Something like this:

public function render() {

if ( ‘/’ === $this->url || empty( $this->url ) ) {

return ”;

}

$r = ”;

$r .= “\t<url>\n”;

$r .= “\t\t<loc>” . $this->escape_xml( esc_url_raw( $this->url ) ) . “</loc>\n”;

$extra_content = apply_filters(‘custom_sitemap_extra_content’, ”, $this->post_id);

$r .= $extra_content;

…

This with the existing filter sm_sitemap_urlset will be very usefull.

Thanks.