...
Each attribute is associated with the specification that defines it. For example, the OpenID Connect specification covers the following attributes:
Attributes
An example attribute entry in the registry appears as follows (this is the Profile attribute from OpenID Connect:
Note the metadata (Object properties and Data properties) recorded in the registry for the Profile attribute. Version 1.0 contains a minimal set of metadata elements. Other types of metadata may be added to suit emerging needs in the attribute ecosystem work.
Another example attribute entry in the registry is eduPersonPrincipalName from the eduPerson specification:
Note the relatively full Definition element in this case. This is drawn from the specification itself.