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    E57 Foundation API v1.1.312
    Aug. 10, 2011
    
   
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 Downcast a generic Node handle to a VectorNode handle. 
 The handle n must be for an underlying VectorNode, otherwise an exception is thrown. In designs that need to avoid the exception, use Node::type() to determine the actual type of the n before downcasting. This function must be explicitly called (c++ compiler cannot insert it automatically). 
 
 
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 1.7.5.1