code: private static InputStream transform(final InputStream origin,
          final URIResolver resolver) throws IOException {
          try {
              final TransformerFactory factory = TransformerFactory.newInstance();
              factory.setURIResolver(resolver);
              return RsXslt.transform(factory, origin);
          } catch (final TransformerException ex) {
              throw new IOException(ex);
          }
      }
docs: Build body.
  @param origin Original body
  @param resolver Resolver
  @return Body
  @throws IOException If fails