Github user ansell commented on the issue:

    https://github.com/apache/commons-rdf/pull/27
  
    Service discovery for other instances of RDFSyntax/Parsers can be done 
separately. 
    
    The main objection was for users of the RDFSyntax interface to be able to 
offer multiple content types and file extensions in addition to the official 
versions. They can be implemented by a default method that just returns the 
official content type and file extension inside of Commons RDF, but the fact 
that the method is available makes it possible to support the use case. 
    
    Returning a List, with the first element by convention being the official 
version similar to RDF4J may be useful, rather than an unordered Set. However, 
that isn't necessary, given they should be using the other methods if they 
definitely want the official extension/content type.


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