A volume link is used to create a new fileNodeId space. One benefit of this is that you can create multiple copies of a volume without changing its rootHash. Because of this, volume links can be used for version controlling a subtree: create a copy of the entire volume to make a snapshot. Because Boomla automatically deduplicates all files, you will only incur a storage cost for the difference between the versions.
Note: automatic URL redirection works only so long a file retains its fileId. Moving a file across volume boundaries will change its fileId.
volume - create an empty volume.