code: public static void transform(final @NonNull File xmlFile, final @NonNull File xsltFile,
  		final OutputStream outputStream)
  		throws TransformerConfigurationException, TransformerException
  	{
  		final Source xmlSource = new StreamSource(xmlFile);
  		final Source xsltSource = new StreamSource(xsltFile);
  		transform(xmlSource, xsltSource, outputStream);
  	}
docs: Transform.
  
  @param xmlFile
  the xml file
  @param xsltFile
  the xslt file
  @param outputStream
  the output stream
  @throws TransformerConfigurationException
  is thrown if there are errors when parsing the <code>Source</code> or it is not
  possible to create a <code>Transformer</code> instance.
  @throws TransformerException
  is thrown if an unrecoverable error occurs during the course of the
  transformation.