How should I tag the accessibility of communal (inbound) letterboxes?
(This may be UK specific) Blocks of flats (apartments) in the UK have various arrangements for the delivery of (letter) mail and leaflets etc to the occupants. There may be a letterflap in each (internal) apartment door, and the apartments themselves may or may not (these days, usually not) be accessible to the public. There may be a bank of mailboxes in a shared lobby (usually inaccessible to the public) or outside the building (usually accessible to the public). For more 'informal' blocks, which might be better described as 'bedsits' or 'houses in multiple occupation' (HMOs) there may be a single, communal letterflap in the main entrance. Some blocks have no letterboxes (for certain types of sheltered or secure blocks).
Would it be appropriate to have a tag along the lines of "flats:letter\_delivery=*" with possible values "internal\_doorflap" (with possible modifier "access=private"), "internal\_mailbox" (with possible modifier "access=private"), "external\_mailbox", "communal\_letterflap" or "none"?
Perhaps there is already a good way of doing this, but I can't find it. Thank you for any guidance.