Annotations

The JSON format:

{
  "metadata": {
    "annotations": {
      "1": { "x": 0.7, "y": 0.6, "w": 0.2, "h": 0.18, "category": "pigments", "text": "prussian blue" },
      "2": { "x": 0.1, "y": 0.8, "w": 0.15, "h": 0.1, "category": "pigments", "text": "azurite" },
      "3": { "x": 0.7, "y": 0.4, "w": 0.1, "h": 0.1, "category": "people", "text": "Mary" }
    }
  }
}

Internally, annotations are saved as XML:

<ph:annotations xmlns:ph="http://phaidra.org/XML/V1.0/annotation">
  <ph:annotation ph:id="1">
    <ph:x>0.7</ph:x>
    <ph:y>0.6</ph:y>
    <ph:w>0.2</ph:w>
    <ph:h>0.18</ph:h>
    <ph:category>pigments</ph:category>
    <ph:text>prussian blue</ph:text>
  </ph:annotation>
  <ph:annotation ph:id="3">
    <ph:x>0.7</ph:x>
    <ph:y>0.4</ph:y>
    <ph:w>0.1</ph:w>
    <ph:h>0.1</ph:h>
    <ph:category>people</ph:category>
    <ph:text>Mary</ph:text>
  </ph:annotation>
  <ph:annotation ph:id="2">
    <ph:x>0.1</ph:x>
    <ph:y>0.8</ph:y>
    <ph:w>0.15</ph:w>
    <ph:h>0.1</ph:h>
    <ph:category>pigments</ph:category>
    <ph:text>azurite</ph:text>
  </ph:annotation>
</ph:annotations>