Support for ulid

[prabhu]

https://github.com/ulid/spec

Currently, serialNumber has to be a uuid beginning with urn:uuid:. We can extend this to add support for ulid and other specifications to empower more modern applications.

[jkowalleck]

What would be a use case for this?
What are edge cases?
What is the scope? What are out-of scopes?
What are the drawbacks?

[prabhu]

Different identifier specs have different use cases and properties. ulid, for instance, supports sorting. As a specification, we can allow the flexibility to support a range of identifiers.