Thanks Igor and Lloyd.
Could we include Canada Post somewhere in the URL so we know that the code are from Canada Post versus other code systems? What about other metadata (e.g. code system name, etc.). Do we need that too for proposal?
Should we also propose are corresponding value set?
With regards to the US state, I assume that we could use the code system URL from the existing value sets that Igor noted - i.e.
https://www.usps.com/? Also, has FHIR defined the other metadata for this code system?