A protocol which must be adopted by a class wishing to handle token-expiration for a particular resource.
 
  
 | Properties | |
| AGSCredential * | credential | 
| - (AGSCredential*) credential  [read, copy] | 
The credential to be used to access secured resources.
Reimplemented in AGSGPResultLayer, AGSDynamicMapServiceLayer, AGSFeatureLayer, AGSImageServiceLayer, AGSTiledMapServiceLayer, and AGSTask.