public void setNamespaceArn(String namespaceArn) {
        this.namespaceArn = namespaceArn;
    }
<p>
The ARN of the namespace.
</p>

@param namespaceArn
       The ARN of the namespace.
aws-java-sdk-iotthingsgraph/src/main/java/com/amazonaws/services/iotthingsgraph/model/DescribeNamespaceResult.java