Atom namespace really not ending with / or # ?

[Jan Algermissen]

Hi,
is it really true that the Atom namespace is http://www.w3.org/2005/ 
Atom ?

Meaning that it is somewhat difficult to identify Atom elements with  
URIs:

http://www.w3.org/2005/Atomauthor
http://www.w3.org/2005/Atomconributor
....


Was that simply a mistake or a design feature when Atom was  
standardized?

Thanks,

Jan