UML22 — composite subsets

There are several places in metamodel where non-derived composite property is subset of other non-derived composite property.
In this case element is owned in two collections, so how it should be reflected in XMI where element could appear just once?
We can leave element just in subset, and merge collections after load, but is this correct?

Below are these occurrences:

classes::mdKernel::Operation::bodyCondition subsets ownedRule

statemachines::mdBehaviorStateMachines::Transition::guard subsets ownedRule

classes::mdKernel::Operation::postcondition subsets ownedRule

statemachines::mdProtocolStateMachines::ProtocolTransition::postCondition
subsets ownedRule

classes::mdKernel::Operation::precondition subsets ownedRule

statemachines::mdProtocolStateMachines::ProtocolTransition::preCondition
subsets ownedRule

Profile::metaclassReference subsets elementImport

uml2.1.1::mdProfiles::Profile::metaclassReference subsets packageImport

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