Difference between template name and template id

Question

C++ Standard

Section 14/2 :

In a function template declaration, the declarator-id shall be a template-name (i.e.,

Answer 1

From C++ Templates: The Complete Guide By David Vandevoorde, Nicolai M. Josuttis

8.3

Explicit template arguments: A template name can be followed by explicit template argument values enclosed in angle brackets. The resulting name is called a template-id.

For example:

template 
struct Demo{ 
    // ... 
};

int main()
{
   Demo  d; // Demo is the template name, Demo is the template-id
   // ...
}

In a function template declaration, the declarator-id shall be a template-name (i.e., not a template-id).

For example (from what I have understood):

class A {
public:
    template  void f(T);
    template  struct X { };
};
class B : public A {
public:
    using A::f;     // fine
    using A::X      // fine

};
class C : public A {
public:
    using A::f;     // ill formed, declarator-id shall not be a template id
    using A::X   // ill formed, declarator-id shall not be a template id

};

Someone please correct me if I am wrong.