Example: Publishing historical data, when history can't be reconstructed

[jpmckinney]

The OCDS model works best when publishers create releases to update a contracting process over its lifetime.

However, when publishing historical data (e.g. information about contracting processes that were completed a decade ago), the publisher might only know the final state; they might not be able to reconstruct the timeline.

In this case, the publisher can publish a single release in the releases array within a record (within a record package), along with a compiled release that is identical except for the value of the tag field.

cc @yolile from Skype discussion on 2019-09-09, in case anything else to add.