code: public String loadFile(final URI fileUri)
      {
          try {
              for (final MigrationLoader loader : loaders) {
                  if (loader.accept(fileUri)) {
                      return loader.loadFile(fileUri);
                  }
              }
              return null;
          }
          catch (IOException ioe) {
              throw new MigratoryException(Reason.INTERNAL, ioe);
          }
      }
docs: Load a file from an URI.