CrowdFlower：if-only 逻辑

Question

我正在尝试使用 CML 语言在 CrowdFlower 中设置任务。使用 only-if 逻辑时，我不断收到以下错误。

contains only-if logic that references a missing field

这是代码。

<cml:radios label="Is there any spoken text in the first audio or is the audio file empty?" class="" validates="required" instructions="Press the play button to play the audio in the above audio file. If you can't hear any audio please select the second option.">

<cml:radios label="Which option do you believe best answers the question" class="unmodified" only-if="is_there_any_spoken_text_in_the_first_audio_or_is_the_audio_file_empty?:[0]" validates="required"><cml:radio label="First option"/><cml:radio label="Second option"/><cml:radio label="Third option"/><cml:radio label="I would like to hear more options"/></cml:radios>

我在他们的文档中到处查看，但似乎没有任何帮助。

Answer 1

事实证明，CML 不喜欢问号（“？”）。我在我的标签中使用了它

<cml:radios label="Is there any spoken text in the first audio or is the audio file empty?" class="" validates="required" instructions="Press the play button to play the audio in the above audio file. If you can't hear any audio please select the second option.">

一旦我删除它，就没有错误了。

希望这对某人有所帮助。