WordPress at a glance
function is not described

trackback_rdf() WP 0.71

Generate and display the RDF for the trackback information of current post.

Deprecated in 3.0.0, and restored in 3.0.1.

No Hooks.

Return

Nothing (null).

Usage

trackback_rdf( $deprecated );
$deprecated(int)
Not used (Was $timezone = 0).
Default: ''

Code of trackback rdf: wp-includes/comment-template.php VER 5.0.3

<?php
function trackback_rdf( $deprecated = '' ) {
	if ( ! empty( $deprecated ) ) {
		_deprecated_argument( __FUNCTION__, '2.5.0' );
	}

	if ( isset( $_SERVER['HTTP_USER_AGENT'] ) && false !== stripos( $_SERVER['HTTP_USER_AGENT'], 'W3C_Validator' ) ) {
		return;
	}

	echo '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
			xmlns:dc="http://purl.org/dc/elements/1.1/"
			xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
		<rdf:Description rdf:about="';
	the_permalink();
	echo '"'."\n";
	echo '    dc:identifier="';
	the_permalink();
	echo '"'."\n";
	echo '    dc:title="'.str_replace('--', '&#x2d;&#x2d;', wptexturize(strip_tags(get_the_title()))).'"'."\n";
	echo '    trackback:ping="'.get_trackback_url().'"'." />\n";
	echo '</rdf:RDF>';
}