[Ext] Chaining MetadataProvider and IdPv3

[Rod Widdowson]

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

There's nothing over and above what's in the schema?

> Whether there’s a difference between:
> [...]
> other than the flags you can set on the MetadataProvider element itself.

None, the only time any of this matters is when you want to specify that a MetadataProvider is searched first (so that one <EnityDescriptor> can trump another and there is enough control in both these cases to allow you to do that.

Rod