Inside my theme-templates (index.php and single.php), withing the loop, I'm using this tag to display the trackback-rdf:
<!-- <?php trackback_rdf(); ?> -->
It seems, that the function trackback_rdf() does not produce any output. When I view my blog's HTML-source with my browser (firefox), the line where the rdf should appear is empty:
Trackbacks and pingbacks are enabled on my site. I'm using WP 2.2.
I have no idea, why the rdf doesn't show up in my html-source. Who can help me :-) ?