Github user stain commented on a diff in the pull request:

    https://github.com/apache/commons-rdf/pull/27#discussion_r95843235
  
    --- Diff: 
simple/src/main/java/org/apache/commons/rdf/simple/experimental/AbstractRDFParser.java
 ---
    @@ -240,7 +240,7 @@ public T rdfTermFactory(RDF rdfTermFactory) {
         public T contentType(RDFSyntax rdfSyntax) throws 
IllegalArgumentException {
             AbstractRDFParser<T> c = clone();
             c.contentTypeSyntax = Optional.ofNullable(rdfSyntax);
    -        c.contentType = c.contentTypeSyntax.map(syntax -> 
syntax.mediaType);
    +        c.contentType = c.contentTypeSyntax.map(syntax -> 
syntax.mediaType());
             return c.asT();
    --- End diff --
    
    It's just a generics trick so that subclasses of `AbstractRDFParser` can 
return their own type in all the setter methods rather than `RDFParser` or 
`AbstractRDFParser`, which would hide any additional methods they specialize 
with.


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