code: protected StringPropertyEditor getRDFCommentEditor(BioPAXElement bpe)
  	{
  		StringPropertyEditor editor;
  		Class<? extends BioPAXElement> inter = bpe.getModelInterface();
  		if (this.getLevel().equals(BioPAXLevel.L3))
  		{
  			editor = (StringPropertyEditor) this.getEditorMap().getEditorForProperty("comment", inter);
  		} else
  		{
  			editor = (StringPropertyEditor) this.getEditorMap().getEditorForProperty("COMMENT", inter);
  		}
  		return editor;
  	}
docs: Paxtools maps BioPAX:comment (L3) and BioPAX:COMMENT (L2) to rdf:comment. This method handles that.
  @param bpe to be bound.
  @return a property editor responsible for editing comments.