Defines how "highly" another Element is giving support for one Element. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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| Visual Basic | 
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Members
| Member name | Description | 
|---|---|
| UnknownPriority | Priority has not been determined. | 
| HighestPriority | |
| SecondHighestPriority | |
| ThirdHighestPriority | |
| FourthHigestPriority | 
Remarks
 For instance, a Column may be a higher priority for a Beam than another Beam. This is useful to find the best supports for a given Element.