I note of potential interest to DFT is some work on Use Cases which are described in the RDA WG use cases page (https://rd-alliance.org/groups/data-citation-wg/wiki/collaboration-environments.html). There are some common elements with other use cases (including some that people like Reagan and Hans described at P3).
They are, for example, interested in  discussing and validating ” the approaches proposed for enabling precise citation of arbitrary subsets of dynamic data.”
 
The  UK Data Archive, for example, notes how they document what they call “collections” and what they are compliant with.
“We prepare a single catalogue record for each ‘collection’ which has about 30 elements and the record is compliant with the Data Documentation Initiative (DDI) and also pushed out as OAI.”
I also the note the useful detail they provide on how they identify things (citation IDs) and what repositories they use (all concept terms we are interested in):
 
“Current citation approach: each record is assigned a DataCIte DOI when published (format is of the type: 10.5255/UKDA-SN-3314-1). We have a distinct methodology for assigning and versioning DOIs. Basically we distinguish between low and high impact changes, with high impact changes promoting a new DOI (with an increment -1, -2 etc.). the DOI resolves to a jump page which lists the history of changes (see 10.5255/UKDA-SN-7037-3). Access is only provided for the most current version, as often changes have been made due to errors, or updates that make the older versions inadvisable to use. Also we have no requests for older versions, as most users are looking for the most up to date information. Our low impact changes, which do not prompt a change on DOI, include correcting typos or other small changes in labels. Higher impact changes include addition or removal of a variable or significant new documentation. We use the APA citation format: Office for National Statistics. Social Survey Division and Northern Ireland Statistics and Research Agency. Central Survey Unit, Quarterly Labour Force Survey, January – March, 2012 [computer file]. 3rd Edition. Colchester, Essex: UK Data Archive [distributor], November 2013. SN: 7037, http://dx.doi.org/10.5255/UKDA-SN-7037-3
We also run an Eprints data repository (http://reshare-integration.ukdataservice.ac.uk/) for longer tail research data, that assigns DOIs at the point of publishing but we have not yet agreed on how to show changes in versions, or whether we allow access to older versions.”
The detail they provide in process is wonderful and allows a pretty rich understanding of what is going on,