OptionalcomparisonOptionalinheritOptionallegacySaved v1 Lists read the first matching property, even when another same-named property set follows it. Other Rules keep any/none semantics.
OptionalmemberThe member of an IfcComplexProperty to read, by Name, one entry per
nesting level: ['Width'], or ['Frame', 'Width'] for a member of a
nested complex property (#5475). Names compare case-insensitively, like
property names. A property that is not complex, or has no such member,
reads as absent. Absent: a complex property reads as its members'
joined text.
OptionalnamePreserve exact IFC name matching when decoding older saved List conditions.
OptionalpropertyHow propertyName reads.
OptionalsetHow setName reads — a regex set name is what lets one rule reach both
Pset_WallCommon and Pset_SlabCommon.
Raw user input. Numeric ops parse as f64; isSet/isNotSet ignore.
OptionalvalueHow value reads. Only consulted by the matches / notMatches ops.
Optionalvalue'si': the rule's numeric operand is in SI base units (metres, square
metres, cubic metres), the way IDS states measure values. Each value is
converted to SI with its own unit (an explicit Unit on the property or
quantity, else the project unit for its measure type) before comparing.
Values with no unit (labels, counts) are compared as stored. Absent:
the operand is in the model's own units (#5225).
Where a missing value may come from (#5433).
'type': a quantity also reads its type's quantity sets (properties always read their type's property sets).'aggregation': an element with no value of its own (its type's included, for quantities too) takes the nearestIfcRelAggregatesancestor's. Never implicit: absent means the element's own (and, for properties, its type's) values only.