AWSTemplateFormatVersion: 2010-09-09
Description: "Test if we are not passing a parameter and are relying on a default value in the child template"
Resources:
  MyStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: !Sub ['https://abucket.${QSS3Region}.amazonaws.com/${Prefix}/templates/DefaultParameter_child.yml', {QSS3Region: !If [ 1, s3-us-gov-west-1, s3]}]
      Parameters:
        ParameterWithDefault: "I am passing a value even though I could skip and use the child stack's default value"