is there a list of saml:Attribute names?

[Cantor, Scott]

>I would like to know if there is a single page/source for values of the name
> attribute for the saml:Attribute tag (and corresponding
> saml:AttributeValue)?

No, but that's also not what you're asking.

> I am looking for a list of shibboleth defined 'http://shibboleth.net/ns/

The set of tags we support for configuration is entirely defined by...the configuration, that's the point of the feature.

https://shibboleth.atlassian.net/wiki/spaces/IDP4/pages/1265631679/MetadataDrivenConfiguration

-- Scott