The W3C Web Annotation Model

Annotorious supports a subset of the W3C Web Annotation model, an open standard for interoperable annotations.

Only a single target shape per annotation is supported.
FragmentSelectors of type Media Fragment are supported for rectangle shapes (see example below), with both pixel- and percent-encoded coordinates.
SVG Selectors aer supported for polygon shapes (see example below).
Annotation TextualBody types with a purpose of commenting, replying or no purpose are displayed as comments.
Annotation bodies with a purpose of tagging are displayed as tags.
Bodies of any other type are ignored, unless you implement your own editor extension.

Annotation IDs

Important: Annotorious requires an id on every annotation. The ID can be any alphanumeric string. Annotations created by users will automatically get a globally unique ID in the form #{uuid}.

Example

[{ 
  "@context": "http://www.w3.org/ns/anno.jsonld",
  "id": "#a88b22d0-6106-4872-9435-c78b5e89fede",
  "type": "Annotation",
  "body": [{
    "type": "TextualBody",
    "value": "It's Hallstatt in Upper Austria"
  }],
  "target": {
    "selector": {
      "type": "FragmentSelector",
      "conformsTo": "http://www.w3.org/TR/media-frags/",
      "value": "xywh=pixel:270,120,90,170"
    }
  }
}, { 
  "@context": "http://www.w3.org/ns/anno.jsonld",
  "id": "#218d01ff-f077-4cc3-992d-1c81c426e51b",
  "type": "Annotation",
  "body": [{
    "type": "TextualBody",
    "purpose": "tagging",
    "value": "Church"
  }],
  "target": {
    "selector": [{
      "type": "SvgSelector",
      "value": "<svg><polygon points='172,160 199,15 223,6 239,132 244,173 285,179 313,208 313,251 218,306 170,290 172,160'></polygon></svg>"
    }]
  }
}]