ReadonlyaddressReadonlyfieldsOptional ReadonlylifecycleReadonlypathOptional ReadonlypolicyWhat a committed write here means for the session's dirtiness and the operator's history. Absent means the layer default: it dirties the session, is not undoable, and is not a barrier (see ResourcePolicy).
Optional ReadonlyripplesOptional ReadonlysinkReadonlystation
The item-lifecycle doors. Clearing a collection is writing the empty value (see above); DELETE is the strictly stronger request — the COLLECTION itself stops existing, which for a DCA or a mute group means the engine's slot is freed, not emptied.