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

@param namespaceArn
       The ARN of the namespace.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-iotthingsgraph/src/main/java/com/amazonaws/services/iotthingsgraph/model/DescribeNamespaceResult.java