[scim] Globally Unique Resource Identifiers

[Shelley <[e-mail]>]

The SCIM specification indicates that the id [1]:

*MUST be unique across the SCIM service provider's entire set of resources.*
>

Is this implying that the identifier must be globally unique across *all
types of resources*, or simply that the identifier must be unique across *all
resources of the same type*? Further, how does this statement account for
*tenancy*?

Requiring uniqueness across resource types may incur undue burden on
service providers to maintain. All resources are relative to a type, e.g.
/Users/<id>. Even the global search functionality doesn't require global
uniqueness because the combination of resourceType and id may be used to
uniquely identify resources. Further, the SCIM 1.1 specification did not
have this requirement, so this could make uplifting to SCIM 2.0 more
difficult for some providers.

[1] https://tools.ietf.org/html/rfc7643#section-3.1