Issuer and IdP Entity Id

[Peter Schober]

* vyal2k <vyal2k at yahoo.com> [2013-12-04 10:43]:
>  Will the value of <Issuer> always be same as IdP's Entity ID in all
> messages from IdP to SP?
> If it can also be something other than IdP's Entity ID, can you
> provide an example of such a case?

It will always be the IdP's entityID. But the IdP /could/ call itself
differently depending on the SP. It would still be the IDP's entityID
then, just that such an IDP would have more than one.
Such a practice is not generally recommended, of course.
-peter