Does R support multi-level namespaces?

Question

Is it possible to have a function in R under several levels of namespaces?

For example, can these functions exist?

 Mymath::Trig::cosine( ) A::B::C::D::foo( ) 

Answer 1

I don’t think so, because the parser does not even cope with this syntax: a::b::c gives

Error: unexpected '::' in "a :: b ::"

ie, we didn’t even get to finding things in the namespace. In contrast, a::b gives

Error in loadNamespace (name): no package named 'a