    linkView.sendToken(token, [options], [callback])

Send a token along the link. `token` is an SVG element (or Vectorizer element) that will be animated along the link path for `options.duration` milliseconds (default is 1000ms). `callback` will be called once the token reaches the end of the link path. `options.direction` specifies whether the animation should play fowards (`'normal'` - from the link source to target, which is the default) or backwards (`'reverse'`).

    // Send an SVG circle token along the link.
    var vCircle = V('circle', { r: 7, fill: 'green' });
    link.findView(paper).sendToken(vCircle, { duration: 500, direction: 'reverse' }, function() {
      console.log('animation end');
    });

Note that in the code above, we use the Vectorizer mini-library to create the SVG circle element.

Please see the Petri Net simulator demo for a full working example.