{
  "ResourceSpecificationVersion": "1.0.0",
  "ResourceType": {
    "AWS::EC2::VPC": {
      "Attributes": {
        "CidrBlock": {
          "PrimitiveType": "String"
        },
        "DefaultNetworkAcl": {
          "PrimitiveType": "String"
        },
        "DefaultSecurityGroup": {
          "PrimitiveType": "String"
        }
      },
      "Documentation": "http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpc.html",
      "Properties": {
        "CidrBlock": {
          "Documentation": "http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpc.html#cfn-aws-ec2-vpc-cidrblock",
          "PrimitiveType": "String",
          "Required": true,
          "UpdateType": "Immutable"
        },
        "EnableDnsHostnames": {
          "Documentation": "http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpc.html#cfn-aws-ec2-vpc-EnableDnsHostnames",
          "PrimitiveType": "Boolean",
          "Required": false,
          "UpdateType": "Mutable"
        },
        "EnableDnsSupport": {
          "Documentation": "http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpc.html#cfn-aws-ec2-vpc-EnableDnsSupport",
          "PrimitiveType": "Boolean",
          "Required": false,
          "UpdateType": "Mutable"
        },
        "InstanceTenancy": {
          "Documentation": "http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpc.html#cfn-aws-ec2-vpc-instancetenancy",
          "PrimitiveType": "String",
          "Required": false,
          "UpdateType": "Immutable"
        }
      }
    }
  }
}