We are developing the FHIR inside our product.
Based on our business logic, we have the need to add extension to some Resources.
for the url under Extension, it states it SHALL be an absolute URL.
I understand the reason that we want this url be global unique, but situation is our product will be installed on various customer base, then it has different fqdn provided by customer.
So, we don't have a fixed address which can represent the url.
then we need to give the url like
the url is likely global unique, but actually not accessible, our company don't host a public fhir server.
is it acceptable from FHIR's point of view?
If yes, wondering why we limit the url to an absolute URL, but an URN
Thanks in advance.