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Gets collection holder. If an affordance points to a collection, there are cases where the resource that has the
affordance is not semantically holding the collection items, but just has a loose relationship to the
collection. E.g. a product "has" no orderedItems, but it may have a loose relationship to a collection of ordered
items where the product can be POSTed to. The thing that semantically holds ordered items is an order,
not a product. Hence the order would be the collection holder.