api - 如何反转MQL查询(对于freebase)？

Question

我正在尝试列出特定ID的所有类型:

{
  "id": "/en/sony",
  "type": [{
    "name": "Topic",
    "id": null
  }]
}

该查询给我以下结果:
http://tinyurl.com/lubavey

{
  "result": {
    "type": [
      {
        "id": "/common/topic",
        "name": "Topic"
      },
      {
        "id": "/base/audiobase/topic",
        "name": "Topic"
      },
      {
        "id": "/base/fblinux/topic",
        "name": "Topic"
      },
      {
        "id": "/base/digitalcameras/topic",
        "name": "Topic"
      },
      {
        "id": "/base/popstra/topic",
        "name": "Topic"
      },
      {
        "id": "/base/televisions/topic",
        "name": "Topic"
      },
      {
        "id": "/base/ps3games/topic",
        "name": "Topic"
      },
      {
        "id": "/base/filmcameras/topic",
        "name": "Topic"
      },
      {
        "id": "/m/04mny2g",
        "name": "Topic"
      }
    ],
    "id": "/en/sony"
  }
}

我想要完全相反的结果。我想要所有没有名称作为“主题”的类型。
我该如何实现？我尝试对属性 !使用 name运算符，该属性在MQL引用指南中建议，但给我错误:

"Can't use unqualified property names with ! reversing".

我该怎么做才能用 !消除此错误并获得相反的查询结果？

Answer 1

尝试!=:

{
  "id": "/en/sony",
  "type": [{
    "name!=": "Topic",
    "id": null
  }]
}

The != operator says that the constrained property can be anything but the specified value. (It does require that the property be something, however: it does not match object for which the property is null.)

在此处阅读有关 !=运算符的更多信息: http://wiki.freebase.com/wiki/MQL_operators#The_.22but_not.22_Operator_.21.3D