A token value with multiple aliases

[romainmenke]

https://tr.designtokens.org/format/#aliases-references

There is no practical use within the current types but at the syntax level for aliases and references it is unclear if only a single or multiple tokens can be referenced?

{
  "hello": { "$type": "text", "$value": "hello" },
  "world": { "$type": "text", "$value": "world" },
  "hello-world": { "$value": "{hello} {world}" }
}

"{hello} {world}" : two other tokens are combined to form a single new value

I personally think this is best left up to users of design tokens to combine values. I think it is sufficient to be able to reference a single token in a single field.

---

Currently missing :

• a parsing algorithm for values that reference other tokens
• error handling algorithm
  • open curly, but no closing curly?
  • double open curly?
  • no token found for a path?

Only circular references have a mention.

Defining this in detail would make it more clear how implementations should behave.

[kevinmpowell]

Related to #200