Implement this to test whether a particular server should be executed. 
   Namespace:   Autodesk.Revit.DB.ExternalService  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Parameters
- server
-  Type:  Autodesk.Revit.DB.ExternalService IExternalServer  
 An instance of a server that is to be tested.
- document
-  Type:  Autodesk.Revit.DB Document  
 The associated document. It may be NULL if not applicable.
- data
-  Type:  Autodesk.Revit.DB.ExternalService IExternalData  
 The associated service data. It is the same data the Execute method would receive.