NameID format values

[Mike Flynn]

What are all of the possible values for Format in NameID:
  <saml2:NameID xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"    Format="urn:oasis:names:tc:SAML:2.0:nameid-format:persistent"    NameQualifier="https://idp.example.org/idp/shibboleth"    SPNameQualifier="https://sp.example.org/shibboleth">  84e411ea-7daa-4a57-bbf6-b5cc52981b73  </saml2:NameID>
I have an IDP that wants to send Format="SPNameQualifier" which seems odd.
Thanks!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://shibboleth.net/pipermail/users/attachments/20170410/3345fc61/attachment.html>