Example of TokenIdentifier for EXT standard?

I’m looking at the ext standard for erc721 tokens and the TokenIdentifier type, which is needed to query for metadata for tokens. The only thing I see regarding the tokens is:

// \x0Atid" + canisterId + 32 bit index
type TokenIdentifier  = Text;

I’m confused on how to formulate the token identifier to query the canister.
Let’s say I want to create a TokenIdentifier for token index 2.
Is it not just something like “rrkah-fqaaa-aaaaa-aaaaq-cai-2”

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