HeatTemplateFormatVersion: '2012-12-12'
Parameters:
  SourceImage:
    Type: String
    Default: my_image
Resources:
  A:
    Type: OS::Nova::Server
    Properties:
      image: {Ref: SourceImage}
  B:
    Type: FileInclude
    Path: examples/lib.yaml
    SubKey: Resources.GenericB
    Parameters:
      ImportantValue: {'Fn::Join': [ '', ['one', 'two', 'three']]}