I enabled trackbacks.
Text Formatted Code
$ xmllint geeklog.rss
geeklog.rss:2: parser error : attributes construct error
<rss version="2.0"xmlns:trackback="http://madskills.com/public/xml/rss/module/tr
^
geeklog.rss:2: parser error : Couldn't find end of Start Tag rss line 2
<rss version="2.0"xmlns:trackback="http://madskills.com/public/xml/rss/module/tr
^
geeklog.rss:2: parser error : Extra content at the end of the document
<rss version="2.0"xmlns:trackback="http://madskills.com/public/xml/rss/module/tr
^
I tried adding a space there manually. This causes a different validation error.
Text Formatted Code
$ xmllint geeklog.rss
geeklog.rss:20: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>Dan Stoner and Family</dc:subject>
^
geeklog.rss:30: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>Dan Stoner and Family</dc:subject>
^
geeklog.rss:40: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>Dan Stoner and Family</dc:subject>
^
geeklog.rss:50: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>Dan Stoner and Family</dc:subject>
^
geeklog.rss:60: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>News</dc:subject>
^
geeklog.rss:70: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>Silly or Interesting</dc:subject>
^
geeklog.rss:80: namespace error : Namespace prefix dc on subject is not defined
<dc:subject>Linux, Open Source, and Tech Stuff</dc:subject>
<snip>