URIs as Globally Unambiguous Identifiers
  - URI has two different uses:
    
      -  Unambiguous name for something
 
      -  Location of a document
 
    
   
  - Name is still useful even without accessing a location!
 
  - URIs can be used to identify concepts
    
      - Especially useful for ontologies & metadata
 
      - Also useful for other data
 
    
   
  - Document at URI can describe the concept