As part of a draft TAG finding, I give the example of http://lccn.info/2002022641. If the authors of the info: URI scheme had taken this route to defining identifiers for existing identifiers, this page would be the place the Library of Congress Control Numbers naming authority could have chosed to describe that identifier as referring to
Newcomer, Eric. Understanding Web services: XML, WSDL, SOAP, and UDDI. Boston: Addison-Wesley, 2002.