NameID Definition and Usage in Shib IDP 4

[Cantor, Scott]

Adding....there is absolutely no circumstance in which you should ever use the unspecified NameID Format. You should refuse to do so in all cases, and there is virtually nothing that requires it.

When passing something in the NameID, the Format used should be set to whatever the attribute Name is, unless it's already a match for some other standard Format constant that would apply.

-- Scott