{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Diagram Caption",
  "description": "Annotated technical figure with a Fig. NN. heading and optional callout pins.",
  "type": "object",
  "properties": {
    "image": {
      "type": "string",
      "title": "Image",
      "description": "Diagram / blueprint / schematic to display.",
      "x-editor": "media"
    },
    "figureNumber": {
      "type": "string",
      "title": "Figure Number",
      "description": "Number printed after the Fig. prefix (e.g. 03).",
      "x-editor": "text"
    },
    "title": {
      "type": "string",
      "title": "Title",
      "description": "Short heading next to the figure number.",
      "x-editor": "text"
    },
    "body": {
      "type": "string",
      "title": "Body",
      "description": "Rich description / annotation text rendered below the figure.",
      "x-editor": "richtext"
    },
    "calloutPins": {
      "type": "array",
      "title": "Callout Pins",
      "description": "Percent-positioned overlay pins; each pin is x, y, label.",
      "default": [],
      "x-editor": "array",
      "items": {
        "type": "object",
        "properties": {
          "x": {
            "type": "number",
            "title": "X (%)",
            "description": "Horizontal position as a percentage of the image width (0-100).",
            "minimum": 0,
            "maximum": 100,
            "x-editor": "number"
          },
          "y": {
            "type": "number",
            "title": "Y (%)",
            "description": "Vertical position as a percentage of the image height (0-100).",
            "minimum": 0,
            "maximum": 100,
            "x-editor": "number"
          },
          "label": {
            "type": "string",
            "title": "Label",
            "description": "Short callout text.",
            "x-editor": "text"
          }
        },
        "required": ["label"]
      }
    }
  }
}