FlattenMappingDialogViewModel Constructor
        
 Initialize a Flatten Mapping view model.
 
         
        Parameters
        
            - mapping
            
 
            - 
                
Type: dundas.data.FlattenMapping
The mapping to initialize the view model with. 
            - isXmlTransform
            
 
            - 
                
Type: Boolean
(optional) Specify whether this VM is for an XML flatten transform. If not specified it's assumed to be for a JSON flatten transform.
Optional: True