How To Store Key Value In MAP As Pair In C++

I'm trying to solve a question on hacker rank named (Attribute Parser) : QUESTION

So I came up with a solution that I could use map but in order to solve it I need to insert two keys 1 would be pair and other would be a string map<pair<string,string>,string>DATA;

I tried DATA.emplace({Type, Tag},Data);

But gave an error : no matching member function for call to 'emplace'

Now how to insert elements as well as access them?

PS:

Thanks for reading.

Sorry for bad English.