Splitting fare legs (aka "split ticketing")

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In GTFS Fares-v2, we have mechanism for joining multiple physical legs into one fare leg. However, is it possible to split a physical leg to multiple fare legs, such that I can apply multiple fare products into a physical leg? (This is commonly known as "split ticketing" in Great Britain)

In addition, in GTFS Fares-v2, how can I define where the fare can be bought / validated? This is also needed to process split ticketing correctly as fares requiring validation at a station outside a vehicle cannot be used when splitting a physical leg into multiple fare legs.