An object that can be used to create new instances of Autodesk Revit API elements within a project. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Field Value
This object is used to create new instances of project elements within the Autodesk Revit API, such as FamilyInstances or groups.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions InvalidOperationException | Thrown when the current document is family document. |