• Weibel, S. "Metadata: the foundations of resource description", D-Lib Magazine, 1(1), July 1995.
  http://www.dlib.org/dlib /July95/07weibel.html
  This very short article is one of the first (the first?) publications on Dublin Core. Given the importance of Dublin Core in all DL projects, reading the first publication will give some insight into how metadata is used in (and out) of a DL environment.
  
• Lagoze, C. "Keeping Dublin Core Simple: Cross-Domain Discovery or Resource Description?", D-Lib Magazine, 7(1), January 2001.
  http://www.dlib.org/dlib/january01/lagoze/01lagoze.html
  This is a very readable introduction to Dublin Core and the concept of qualifier s, and how qualifiers can be used to accommodate different uses and communities. It illustrates the natural tension between simplicity and usefulness and shows how far DC has come.
  
• "About "INFO" URIs: Frequently Asked Questions"
  http://info-uri.info/registry/docs/misc/faq.html
  RFC 4452 is canonical, but the FAQ is more readable.
• Tim Berners-LEe, "Cool URIs Don't Change"
  http://www.w3.org/Provider/Style/URI