+ # Returns `self` namespace decorated with HTML links.
+ #
+ # * MProject: `mproject`
+ # * MGroup: `mproject(::group)`
+ # * MModule: `mgroup::mmodule`
+ # * MClass: `mproject::mclass`
+ # * MClassDef: `mmodule::mclassdef`
+ # * MProperty: `mclass::mprop`
+ # * MPropdef: `mclassdef:mpropdef`
+ fun html_namespace: Template is abstract
+