OptionalincludeOpt-in, source: "classification" only: give value-less entities a real
legend entry instead of silently ghosting them (#unclassified-bucket).
Two absence reasons are distinguished whenever psetName (the
classification-system filter) is set, because they mean different things:
"No classification" (zero classification references at all) vs. "Not in
this system" (the entity has references, just none in the selected
system). Collapsing them would hide that distinction behind one number.
When psetName is unset there is no system to be "not in", so only "No
classification" is emitted.
Default false/unset preserves the pre-existing behaviour exactly:
value-less entities are ghosted (GHOST_COLOR, no legend entry, no
count). This is deliberately opt-in, not a new default — an existing
saved lens (or a consumer relying on ghosted-and-invisible unclassified
elements) must not change appearance on upgrade.
Forward compatibility: this field is additive. An engine build that
predates it does not read it, so an exported lens with
includeUnclassified: true opened in an older build silently falls back
to ghosting the absent entities — the pre-existing, safe behaviour —
rather than doing anything wrong with a field it doesn't understand.
OptionalpropertyAttribute, property, or quantity name
OptionalpsetProperty/quantity set name — for source "property" or "quantity". For source "classification" it acts as a classification-system filter (case-insensitive substring match), selecting which reference to key off.
Data source specification for automatic coloring.
In auto-color mode, the engine iterates all entities, extracts the specified value, groups by distinct values, and assigns a unique color to each group. No manual rule authoring needed.