Better

Put the "safe" XHTML sanitization in lib/santize.rb, rather than in lib/chunks/nowiki.rb.
D'oh!

lib/chunks/nowiki.rb

@@ -1,6 +1,5 @@
 require 'chunks/chunk'
 require 'sanitize'
-require 'rexml/document'
 
 # This chunks allows certain parts of a wiki page to be hidden from the
 # rest of the rendering pipeline. It should be run at the beginning
@@ -27,15 +26,7 @@ class NoWiki < Chunk::Abstract
 
   def initialize(match_data, content)
     super
-    begin
-      sanitized = sanitize_xhtml(match_data[1])
-      doc = REXML::Document.new("<div xmlns='http://www.w3.org/1999/xhtml'>#{sanitized}</div>")
-      sanitized = doc.to_s.gsub(/\A<div xmlns='http:\/\/www.w3.org\/1999\/xhtml'>(.*)<\/div>\Z/m, '\1')
-    rescue REXML::ParseException
-      sanitized = %{<pre class='markdown-html-error' style='border: solid 3px red; background-color: pink;'>HTML parse error:
-#{sanitized.escapeHTML}</pre>}
-    end
-    @plain_text = @unmask_text = sanitized
+    @plain_text = @unmask_text = safe_sanitize_xhtml(match_data[1])
   end
 
 end