Jena Riot在Jena TDB数据集中更新本体时出现异常

输入参数:modelName->保存在TDB中的namedModel 输入字符串->本体数据转换为字符串 我的代码如下:

public void updateModel(String modelName, String inputString) {
    dataset.begin(ReadWrite.WRITE);
    try {
        Model model = dataset.getNamedModel(modelName);
        model.removeAll();
        StringReader reader = new StringReader(inputString);
        model.read(reader,null,"RDF/XML-ABBREV");
        dataset.commit();
        logger.info("dataset committed");
    } catch (Exception e) {
        logger.error("Exception in reading : " + e);
    } finally {
        dataset.end();
    }

}

它抛出以下错误:org。阿帕奇。杰娜。暴乱RiotException:[line:1,col:1]prolog中不允许包含内容。