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With RDF annotations, it's possible to fetch annotation resource from a different location. For example: overlaying a Flickr image on top of a video.

With Constrained Targets, it's also possible to do complex annotations like a polygon or an SVG. See list of known constraints.

The OAC file is fetched via AJAX and turned into Javascript objects using a custom library. Annotations are then overlaid on top of the video using our video player.