Numerical Attributes

key: a short string that serves as the identifier for the attribute
value: an object that should have the following keys:
- description: a human-readable string describing the attribute to a labeler.
- type: a string describing the type of attribute. Must be number for numerical attributes.
- min (optional): The minimum number that may be chosen as the attribute.
- max (optional): The maximum number that may be chosen as the attribute.
- step (optional, default 1): The legal number intervals for the attribute.
- conditions (optional): a JSON that describes the conditions under which this attribute should be collected.

{
  "geometries": {
     ...
  },
  "annotation_attributes": {
    "example_number": {
      "type": "number",
      "description": "What is the answer to this example question?",
      "min": 0,
      "max": 100
    }
  }
}