public void setNamespaceVersion(Long namespaceVersion) {
        this.namespaceVersion = namespaceVersion;
    }
<p>
The version of the user's namespace to describe.
</p>

@param namespaceVersion
       The version of the user's namespace to describe.
aws-java-sdk-iotthingsgraph/src/main/java/com/amazonaws/services/iotthingsgraph/model/DescribeNamespaceResult.java