I also reviewed previous version -03 of this document. All my objections and recommendations from that review have been taken into consideration, except for this one:

In JSON representation of leafref instance values, the module prefix "ietf-nss" cannot be used as a namespace identifier (because the prefix isn't declared in JSON). In the namespace-qualified form, the full module name has to be used. However, no namespace is needed here because the referred identities are defined in the same module as the leafref data nodes. See section 6.8 in RFC 7951. Therefore, it is necessary to either replace all 75 occurences of the "ietf-nss" prefix in Appendix B with "ietf-network-slice-service", or remove the prefixes altogether.

**** Nits

- Names of several lists are somewhat confusing. For example, list "tag-type" has two children: "tag-type" (key) and "value". It would IMO be better to call the outer list e.g. "tag-type-value".
- Upcoming RFCs with placeholder numbers BBBB, CCCC and DDDD that are used in reference statements should also appear in sec. 11.1 (Normative References).