Jane's approach is pretty much what the thinking was in introducing the 'Area' information Group in MIDAS Heritage 1.1 to complement 'Monument' and 'Artefact' as asset types.
Basically the suggestion there is to record a large project as an area of interest (with attached 'Map Depiction' information), with specific event records covering more detailed investigation within that area as appropriate. We thought this was pretty experimental at the time, so it is interesting to see this discussion of the practicalities.
Ful text is at
https://content.historicengland.org.uk/images-books/publications/midas-heritage/midas-heritage-2012-v1_1.pdf/
Ed
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