For recording every election in the UK
The elections table stores a list of election objects, each with a semantic ID.
Election IDs sometimes have a parent, and are sometimes a "group ID".
There are two types of group ID:
[type].[date], for example
local.2017-05-04will be the group for all local elections happening on 2017-05-04.
[type].[organiation].[date], for example
local.norfolk.2017-05-04is the Norfolk County Council elections.
Finally an ID is made per ballot paper using
[type].[organiation].[organisation division].[date] for example