code: function(annotation) {
  			if (!annotation) { return; }
  			var index = this._getAnnotationIndex(annotation);
  			if (index < 0) { return; }
  			var e = {
  				type: "Changed", //$NON-NLS-0$
  				added: [],
  				removed: [],
  				changed: [annotation]
  			};
  			this.onChanged(e);
  		}
docs: Notifies the annotation model that the given annotation has been modified.
  <p>The annotation model listeners are notified of this change.</p>
  
  @param {orion.editor.Annotation} annotation the modified annotation.
  
  @see orion.editor.AnnotationModel#addAnnotation