URL of the ArcGIS Server map service exposed as a REST resource that will receive query request. An example is http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Portland/Portland_ESRI_LandBase_AGO/MapServer. For more information on constructing a URL, see The ArcGIS Services Directory and the REST API in the Help general discussion.

 function get Url () : String
 function set Url (value : String)