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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.

Attribute Class

At the top of the eduPersonPrincipalName example above, there is the object property "isClassifiedBy" with the value "Identifier". This is an example of a metadata element meant to categorize attributes across specifications into a defined set of types. This metadata element is called "Attribute Class".  Here is the first part of a listing of the currently defined attribute classes: Image Added
A couple examples will clarify the notion of attribute class.  Take the example of attributes relating to preferences. Image Added
The Open Social specification (attributes whose prefix is "osoc" contains two attributes in the class "preference". And the LDAP specification (currently RFC4524) contains an attribute "drink" which indicates personal preference as well.  Here is the preference attribute, osoc-emails-primary: Image Added