Schema.org 'specialty' 属性 失败，问答类型："The property specialty is not recognised by Google for an object of type Question."

Question

我正在尝试使用 JSON-LD 在 Schema.org 文档之后添加 specialty 属性。根据 QAPage 文档，specialty 确实是该模式类型的有效值。

问题是当我用 Google 的 Structured Data Testing Tool 验证时，它吐出这个错误：

(The property specialty is not recognised by Google for an object of type Question.)

现在，Schema.org 部分 运行 由 Google，所以我不认为这是他们的错误。很确定它可能是 JSON-LD 语法，但我整个早上都在尝试不同的东西。任何人都可以阐明这个问题吗？

{
"@context": "https://schema.org",
"@type": "QAPage",
"mainEntity": {
  "@type": "Question",
  "name": "How many ounces are there in a pound?",
  "text": "I have taken up a new interest in baking and keep running across directions in ounces and pounds. I have to translate between them and was wondering how many ounces are in a pound?",
  "specialty": "SEO",   //ISSUE LINE 
  "answerCount": 3,
  "upvoteCount": 26,
  "dateCreated": "2016-07-23T21:11Z",
  "author": {
    "@type": "Person",
    "name": "New Baking User"
  },
  "acceptedAnswer": {
    "@type": "Answer",
    "text": "1 pound (lb) is equal to 16 ounces (oz).",
    "dateCreated": "2016-11-02T21:11Z",
    "upvoteCount": 1337,
    "url": "https://example.com/question1#acceptedAnswer",
    "author": {
      "@type": "Person",
      "name": "SomeUser"
    }
  },
  "suggestedAnswer": [
    {
      "@type": "Answer",
      "text": "Are you looking for ounces or fluid ounces? If you are looking for fluid ounces there are 15.34 fluid ounces in a pound of water.",
      "dateCreated": "2016-11-02T21:11Z",
      "upvoteCount": 42,
      "url": "https://example.com/question1#suggestedAnswer1",
      "author": {
        "@type": "Person",
        "name": "AnotherUser"
      }
    }, {
      "@type": "Answer",
      "text": " I can't remember exactly, but I think 18 ounces in a lb. You might want to double check that.",
      "dateCreated": "2016-11-06T21:11Z",
      "upvoteCount": 0,
      "url": "https://example.com/question1#suggestedAnswer2",
      "author": {
        "@type": "Person",
        "name": "ConfusedUser"
      }
    }
  ]
}
}

Answer 1

需要将 specialty 属性 添加到 WebPage（或其 sub-types 之一，例如 QAPage）。

您已将其添加到 Question (where it’s not listed)。