Github user afs commented on the issue:

    https://github.com/apache/jena/pull/139
  
    I'm not opposed to adding "Context" variants on principle, just a concern 
about warping the API in the application writers view by many operations (not 
that there are a few at the moment!). There are 22 write(...) operations 
currently. Or maybe only for the 11 `RDFFormat` forms (the Lang/RDFFormat being 
one of the causes of so many options)
    
    Adding the PrefixMap variants (4 new operations : 2 each for graph and 
datasetgraph writers).
    
    This should work and it's a bit shorter: the machinery for 
DatasetGarph/Graph is built-in:
    
    ```
    private void writeExample(OutputStream out, Model m, RDFFormat f, Context 
jenaContext) {
            WriterGraphRIOT w = RDFDataMgr.createGraphWriter(f) ;
            Graph g = m.getGraph() ;
            w.write(out, g, RiotLib.prefixMap(g), null, jenaContext);
        }
    ```


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