heat_template_version: 2013-05-23 parameters: SourceImage: type: string default: my_image resources: A: type: OS::Nova::Server properties: image: {get_param: SourceImage} B: type: FileInclude Path: examples/lib_hot.yaml SubKey: resources.GenericB parameters: ImportantValue: {list_join: [ '', ['one', 'two', 'three']]}