[Ext] Chaining MetadataProvider and IdPv3

[Nate Klingenstein]

>> Is it still mandatory?
> 
> ISTR that old style relying party needs it.

Any recollection regarding metadata-providers.xml’s requirements?

>> 2)  Is there any functional difference between having a Chaining element
>> wrapped around two providers and having multiple EntityDescriptors beyond
>> the modest control provided by the MetadataProvider configuration itself?
> 
> I'm not sure I understand the question.  But I can tell you that all that
> happens if the parser meets multiple metadata providers is that it grows an
> implicit chaining provider and inserts it.

Whether there’s a difference between:

<MetadataProvider id="chain" xsi:type="ChainingMetadataProvider">
    <MetadataProvider id="LocalMetadata" xsi:type="FilesystemMetadataProvider" ...>
      <!-- ... -->
    </MetadataProvider>
     
    <MetadataProvider id="FederationMetadata" xsi:type="FileSystemMetadataProvider" ...>
      <!-- ... -->
    </MetadataProvider>
</MetadataProvider>

with two files

and

<MetadataProvider id="chain" xsi:type="ChainingMetadataProvider">
    <MetadataProvider id=“ConcatenatedMetadata" xsi:type="FilesystemMetadataProvider" ...>
      <!-- ... -->
    </MetadataProvider>
</MetadataProvider>

other than the flags you can set on the MetadataProvider element itself.

Thanks so much,
Nate.