template depth problem

Trying to have the following usage; however, gcc is not liking.

#include <boost/smart_ptr.hpp>

namespace xyz {
class elem {
public:
     typedef boost::shared_ptr<elem>     elem_sptr;
};

}

#include <map>

namespace abc {
template <typename ObjectType>
class BaseContainer
{
    typedef std::map<int, ObjectType::elem_sptr> Container;

    // tried this too
    //typedef std::map<int, boost::shared_ptr<ObjectType> > Container;

    typedef Container::iterator iterator;

     Container  c;
};

}

void main()
{
    abc::BaseContainer<xyz::elem>  elem_container;
}

Any thoughts on the usage?

Thanks
Venkat

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