private byte[] process(byte[] input, PropertyResolver props) throws IOException {

        VelocityContext context = new VelocityContext();

        context.put("context", props);

        try {

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            Writer writer = new OutputStreamWriter(baos);

            Velocity.evaluate(context, writer, "", new InputStreamReader(new ByteArrayInputStream(input)));

            writer.flush();

            return baos.toByteArray();

        }

        catch (IOException ioe) {

            throw new IOException("Error processing the artifact: " + ioe.getMessage());

        }

    }