Validation error

Hello list,

i have prepared a Mallard file like that one: http://pastebin.com/dy9ji
g2j .

The problem is, if i'm using yelp-check validate ThatPage.page i'm
getting:


sascha at sascha-desktop:~/RiderProjects/PublicanCreators/help/C$ yelp-
check validate app-config.page 
app-config.page:2: element page: Relax-NG validity error : Expecting a
namespace for element page
app-config.page fails to validate


But why?

Greetings
Sascha
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