# ifc-geometry select instructions
Scope: Compiled EXPRESS SELECT membership and subtype classification.
Follow the crate `../../AGENTS.md`.
## Owns
- entity and aggregate select projections
- compiled subtype closure used by selects
- positive and negative membership tests
## Does not own
- schema parsing at runtime
- lowering decisions beyond declared membership
- wildcard acceptance of unknown types
## Growth map
`entity_selects.rs`, `aggregate_selects.rs`, `subtype.rs`. These source owners already compile as private scaffold modules. Replace a module's planned-owner marker with its first real contract and tests; do not add parallel placeholders.
Every source entity error cites EntityId/type/slot or rule. Add invalid, cycle,
and unsupported cases, not only happy paths.