* Generates a {@link Schema} for RELAX NG from a file.
     *
     * @param schema
     *            RELAX NG file. Must not be {@literal null}.
     * @return {@link Schema}
     */
    public static Schema newRelaxNgSchema(final File schema) {
        assertArgumentNotNull("schema", schema);
        return newSchema(SchemaFactoryUtil.newRelaxNgSchemaFactory(), schema);
    }

    /**