public Builder addAdditionalIdentifier(Set<String> additionalIdentifier) {
            this.additionalIdentifiers.add(additionalIdentifier);
            return this;
        }
Get a list of sets of member shape ids, each set can be used to identify
the CloudFormation resource in addition to its primary identifier(s).

@return Returns identifier sets used to access a CloudFormation resource.
smithy-aws-cloudformation-traits/src/main/java/software/amazon/smithy/aws/cloudformation/traits/CfnResource.java