Added an example RSS generation.

Signed-off-by: Chris Schneider <chris@christopher-schneider.com>

book/Views.markdown

@@ -49,6 +49,32 @@ This will render the xml inline, directly from the handler.
 #### Atom Feed
 
 #### RSS Feed
+Assume that your site url is http://liftoff.msfc.nasa.gov/.
+
+    get '/rss.xml' do
+      builder do |xml|
+        xml.instruct! :xml, :version => '1.0'
+        xml.rss :version => "2.0" do
+          xml.channel do
+            xml.title "Liftoff News"
+            xml.description "Liftoff to Space Exploration."
+            xml.link "http://liftoff.msfc.nasa.gov/"
+            
+            @posts.each do |post|
+              xml.item do
+                xml.title post.title
+                xml.link "http://liftoff.msfc.nasa.gov/posts/#{post.id}"
+                xml.description post.body
+                xml.pubDate Time.parse(post.created_at.to_s).rfc822()
+                xml.guid "http://liftoff.msfc.nasa.gov/posts/#{post.id}"
+              end
+            end
+          end
+        end
+      end
+    end
+
+This will render the rss inline, directly from the handler.
 
 Layouts
 -------