c++ - .template (dot-template) construction usage

I've come across a strange segment of code:

#include 

template 
struct Collection {
  int data[N];

  Collection() {

    for(int i = 0; i < N; ++i) {
      data[i] = 0;
    }
  };

  void SetValue(int v) {
    for(int i = 0; i < N; ++i) {
      data[i] = v;
    }
  };


  template 
  int GetValue(void) const {
    return data[I];
  };
};

template 
void printElement(Collection const & c) {
  std::cout << c.template GetValue() << std::endl; /// doesn't compile without ".template"

}

int main() {
  Collection<10> myc;
  myc.SetValue(5);
  printElement<10, 2>(myc);
  return 0;
}

It is not compiled without .template keyword in printElement function. I've never seen this before and I don't understand what is needed for. Trying to remove it, I got a lot of template-related compilation errors. So my question is when such a construction is used? Is it common?