Thanks, brockhaus, for investigating further. I was sure about the code being used (because I saw it on network trace). But I had no time to dig into it again. Now you've done it.

So s9y uses both trackbacks and pingbacks. Since the RDF part was missing in my tests to WP, there was no trackback ...

Sorry, could not get back to you sooner. I've mailed with someone with a WP blog and sent him the description, how to insert RDF code. He did and now trackbacks to his blog do work. If someone needs that link to send it to WP blog owners: http://codex.wordpress.org/Template_Tags/trackback_rdf

When ...

Hi,

first post, and starting off with a bug. Not a nice way to start into a forum, I guess. ;)

I'm pretty sure, I found a bug yesterday. I'll start off with the current trackback function XML.

<?xml version=\"1.0\"?>
<methodCall>
<methodName>pingback.ping</methodName>
<params>
<param>
<name ...