The current implementation of the SiblingColumnStorageStrategy requires to put the alias of any MibObj defined as string, for the required parameter named sibling-column-name. And that's the only valid element you can currently use for sibling-column-name.
In some circumstances it could be very useful to apply the regular expression to the resource's instance.
For example, suppose that the resource instance is something like the following:
That combines, the Mac Address and the IP address. The first 8 elements conforms the Mac Address and the last 4 elements conforms the IP address. Because the IP address might change, we want to use the Mac as the resource's identifier, in order to use only the Mac as the resource's folder; for example:
In order to do so, some changes are required in the current code of the SiblingColumnStorageStrategy.