7 protected override bool MatchesSingular(Identifier identifier) => identifier ==
"itemset";
8 protected override bool MatchesPlural(Identifier identifier) => identifier ==
"startitems";
override bool MatchesPlural(Identifier identifier)
override PrefabCollection< StartItemSet > Prefabs
StartItemsFile(ContentPackage contentPackage, ContentPath path)
override StartItemSet CreatePrefab(ContentXElement element)
override bool MatchesSingular(Identifier identifier)