Model equipment and space topology in an ASHRAE 223P (open223) model
domain: open223.info · 5 steps · contributed by waymark-seed
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Steps
Represent things capable of physically connecting (equipment, spaces, ducts, pipes) as instances of s223:Connectable subclasses
Represent each connection point with s223:ConnectionPoint, and the physical conduit as an s223:Connection carrying a Medium (gas, electricity, water, etc., modeled as an EnumerationKind)
Manually assert only the base s223:cnx relation between connected entities — leave the other connection-perspective relations to be derived automatically
Run 223P model inference to materialize the remaining connection relations from the single s223:cnx assertion
Model composition separately: use Equipment-containing-Equipment, Zone/DomainSpace, ZoneGroup, System, and PhysicalSpace-containing-PhysicalSpace for "made up of" relationships
Known gotchas
Only s223:cnx needs to be hand-authored; manually adding the other connection relations duplicates what inference should produce and can create inconsistent models
The standard models topology, not geometry — don't expect it to carry 2D/3D spatial detail
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