ifc-systems

Distribution systems, ports, and connectivity between elements.

Overview

ifc-systems -- Distribution systems: ports, connectivity and system grouping.

23 entities in IFC4. Turns a bag of pipes and ducts into a connected network that can be traced -- the basis of any MEP analysis.

Latest release, 0.3.0 (2026-09-29):

The authoring draft ClassifiedSystemDraft is #[non_exhaustive]: build it with ClassifiedSystemDraft::new() and the setters description, object_type, predefined_type and long_name. Fields stay public.
The bulk readers no longer fall back to the IFC4 table. systems, ports, zones, spatial_placements, role_inconsistencies, ConnectionGraph::build and ElementRole::of return Result<_, SchemaResolutionError> and refuse a header that binds no verified release: no FILE_SCHEMA (an in-memory model now needs a header), several, IFC4X1/IFC4X2, or a release this build does not bundle. ElementRole::of returns Result<Option<_>, _>.
try_zones is removed: zones now has the error channel it added.
IFC4X3 is verified for every reader (#215), not only the zone readers: schema_of resolves it. Every fixed slot the readers use is pinned against the IFC2X3, IFC4 and IFC4X3 tables, and tests/ifc4x3.rs round-trips systems (including IfcBuiltSystem), both port attachments, connections, flow roles and spatial placements through IFC4X3 STEP text.
SystemAnomaly and RoleInconsistency are #[non_exhaustive]: a match needs a wildcard arm.
The read-side Connection, Port, System, Zone and SpatialPlacement are #[non_exhaustive], so a later release's attribute can be added without a breaking change; they can no longer be built with a struct literal outside the crate.

Depends on ifc-schema with its default features named explicitly (every bundled release), now that the workspace dependency turns them off for the facade's per-release features (#112).
A model whose header declares IFC4X1 or IFC4X2 is refused with the existing unsupported-schema error. ifc-schema now bundles both releases, but no layout here is verified against them, so they are never read as IFC4 or IFC4X3.