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Service Providers should only request attributes that the service actually uses, so for example if email address is not required by the service it should not be requested. The specification does not explicitly prevent Service Providers from requesting attributes outside the R&S attribute bundle but strongly suggests that they do not ("Service Providers SHOULD request a subset of R&S Category Attributes", section 5 of the specification). R&S works best for both Identity Providers and Service Providers when the bundle is treated as the maximal set of attributes requested. Service Providers requiring more unique / bespoke attribute bundles should discuss their use case with the wider REFEDS community

That said, if an SP requests an attribute outside the R&S attribute bundle, an IdP that supports R&S is by no means required to release it. See the previous question for details about attribute release.

What exactly is meant by a "production SAML deployment?"

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