Right now, the spec does not normatively mandate the semantics of a chain of metadata statements. This is crucial part of being able to use OIDC Fed to trust other entities, and SHOULD definitively be part of the spec.
The spec does describe the process of metadata flattening in Appendix A. Constructing Entity Metadata.
When fixing this issue, also remove this issue from Appendix C. Open Issues
| Why is the Constructing Entity Metadata appendix not normative? I believe that it should be.