afs commented on issue #2808:
URL: https://github.com/apache/jena/issues/2808#issuecomment-2444879696

   The datatype registry provides the unique references. It's an open-ended 
enum.
   
   `LiteralLabelFactory` should not be considered application facing API. It's 
in `impl`.
   
   > uniqueness isn’t defined by the URI
   
   That's contract for RDF datatypes.
   
   > `if (... || getClass() != o.getClass()) return false;`
   
   I think chaos will result if "same URI, different class". It will be lost on 
printing and storing in a database.
   
   Maybe define `equals` and `hashCode` as final.
   


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