I find the hyperlink and tooltip of classes, fields and methods really useful.
Please also provide those to package and namespace.
Something like:
namespace Dummy #DDDDDD [[http://www.google.com {this is a tooltip on Dummy}]] {
(--------)
Good idea! This is available in last beta :
https://www.dropbox.com/s/koo42q3d9gxw288/plantuml.jar?dl=0
However, you have to reverse the order of Color and Url:
namespace Dummy [[http://www.google.com {this is a tooltip on Dummy}]] #DDDDDD {