# tokens in Partial Concrete Syntax
What sort of tokens should I track in the syntax?
- delimiters like e.g. in `[a, b, c]`?
- more significant separators like the `:` in `{ "foo" : a }`?
- What about groupin symbols like `{ ... }`?
- What about keywords? e.g. `fn` or `for` or `while`?

Can these questions be answered universally, or is this application dependent?
- For example, maybe when building a compiler, we don't need to track so much stuff.
- But for formatter, we probably need to track a bit more.
- But what about something like a library in a IDE that handles various transformations of the code?

# delimiter confusion
I just realized that I've been misunderstanding the word `delimiter`.
I thought that a delimiter was like the `,` in `[ a, b, c]`. But that's called properly called a separator! Or item-separator.
I thought separator and delimiter where synonyms. But it seems like a `delimiter` is actually the grouping symbols like `[` or `]`.