id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
11734	trackback_rdf() for IDN (xn--) Domains produces invalid HTML	lathspell		"Hello

The trackback_rdf() function from wp-includes/comment-template.php wraps the ""<rdf:RDF>...</rdf:RDF>"" output inside ""<!-- ... -->"" HTML comments, probably to be safe as not all Browsers understand them.

When using Wordpress 2.9.1 on a site with an international domain name [1] that contains special characters like German ""Umlauts"" like äöü, this domain name is written as e.g. xn--tst-qla.de for täst.de.

Now the output of trackback_rdf() suddenly gets a ""--"" which is the SGML/HTML comment separator mark [2]. Firefox 3.5.6 e.g. sees this as the end of the comment and therefore shows the final ""-->"" as text to the user.

As the whole RDF tag is supposed to be invisible for the user, it's a bug in Wordpress :-(

Here is an real world example output:

{{{
                     <p class=""post-tags"">

                      </p>
				  <p class=""post-info"">
					  				  </p>
				  <!--
				    <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=""http://xn--bcher-entdecken-zvb.de/wordpress/index.php/wortlieblinge/""
    dc:identifier=""http://xn--bcher-entdecken-zvb.de/wordpress/index.php/wortlieblinge/""
    dc:title=""Wortlieblinge""
    trackback:ping=""http://xn--bcher-entdecken-zvb.de/wordpress/index.php/wortlieblinge/trackback/"" />
</rdf:RDF>				  -->
			  </div>
}}}


Sadly I have not yet come up with a solution. PHPs urlencode() does not escape a double dash - which is ok as its usually perfectly valid. Maybe someone with RDF experience has a good idea.

bye,

-christian-


[1] http://en.wikipedia.org/wiki/Internationalized_domain_name#Example_of_IDNA_encoding

[2] http://htmlhelp.com/reference/wilbur/misc/comment.html



"	defect (bug)	new	normal	Future Release	General	3.1	normal		close	david_v_wright@… codestyling