Straight from the code:

Timeline.DefaultEventSource.Event.prototype

Event Methods: 

 getID:          function() { return this._id; },
   isInstant:      function() { return this._instant; },
   isImprecise:    function() { return this._start != this._latestStart || this._end != this._earliestEnd; },
   getStart:       function() { return this._start; },
   getEnd:         function() { return this._end; },
   getLatestStart: function() { return this._latestStart; },
   getEarliestEnd: function() { return this._earliestEnd; },
   getText:        function() { return this._text; },
   getDescription: function() { return this._description; },
   getImage:       function() { return this._image; },
   getLink:        function() { return this._link; },
   getIcon:        function() { return this._icon; },
   getColor:       function() { return this._color; },
   getTextColor:   function() { return this._textColor; },
   getProperty:    
   getWikiURL:     function() { return this._wikiURL; },
   getWikiSection: function() { return this._wikiSection; },
   setWikiInfo: function(wikiURL, wikiSection) {
Retrieved from "http://simile.mit.edu/wiki/Event_Sources"