[GitHub] jena issue #161: Plain begin

[afs]

Github user afs commented on the issue:

    https://github.com/apache/jena/pull/161
  
    Example:
    ```
        public static void dsgTxn() {
            DatasetGraphTransaction.promotion = true ;
            DatasetGraph dsg = TDBFactory.createDatasetGraph() ;
    
            Quad q1 = SSE.parseQuad("(_ :s :p1 1)") ;
            
            dsg.begin(ReadWrite.READ); 
            // Start R->W here
            dsg.add(q1) ;
            dsg.commit();
            dsg.end() ;
    
            Txn.execRead(dsg, ()->{
                RDFDataMgr.write(System.out, dsg.getDefaultGraph(), Lang.NT);
            });
            
            System.out.println("DONE") ;
        }
    ```
    
    NB Current `Txn` does not work for promotion - it needs to `commit()`, not 
just `end()` a read transaction.


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