Introduction to IHE

I was asked for recommendation for a set of resources that would give a good introduction to IHE:

One always wishes they could create new material, but realistically there exists plenty of resources already published that can be leveraged:

Is it general intro to what is IHE?

Is it specific to Document Sharing (aka XDS, XCA, XDR, XDM, etc)?

Is it IHE work on FHIR?

Advanced work by ITI

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