fileUri = new URI(URLEncoder.encode(fileref, StandardCharsets.UTF_8.toString()));
} catch (URISyntaxException | UnsupportedEncodingException e) {
throw new IllegalArgumentException("File ref in " + imageDataNode + " is badly formatted", e);
fileUri = new URI(URLEncoder.encode(fileref, StandardCharsets.UTF_8.toString()));
} catch (URISyntaxException | UnsupportedEncodingException e) {
throw new IllegalArgumentException("File ref in " + imageDataNode + " is badly formatted", e);