Returns the ids of the lining elements associated to a given element. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The document.
- elemId
-  Type:  Autodesk.Revit.DB ElementId  
 The element.
Return Value
A collection of the ids of the lining elements.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | This id does not represent a duct, fitting, or accessory element. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |