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This operation describes the partial ordering with which Availability domains form a lattice. As a temporary measure, a containment ordering needs to be specified for the Swift language, Embedded, and Package Description domains. Without this ordering, there won't be a way for AvailabilityContext to preserve the invariant that the unavailable domain of a child context contains the unavailable domain for the parent. However, once AvailabilityContext is refactored to represent the status of multiple availability domains simultaneously, the ordering of these domains relative to each other can be relaxed. NFC.