question to understand templates

Dear all,
I'm trying learn templates concept.

Here is a line of code from Bjarne Strustrup's C++ programming
language 3rd edition:

template<class C> struct String<C>::Srep

I couldn't understand what the above line of code means. I'm expecting
"struct/class <name>" after template<class C>. What exactly
String<C>::Srep mean? Does "String" refer to STL's string template?

Thanks,
Bharath

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