Add support for Item subclasses. #1467
Merged
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Make it possible to have linked
SingleItem(sv: "Exemplar") insideItemhasComponent.SingleItemis in collectionnoneinstead ofholdso that we don't get any of the special handling for holdingsSingleItemrecords per libraryhasComponentof a regular holding recordIteminstead of just collectionholdSingleItemSee also
libris/definitions#494
Later on
Itemmight be replaced byItemHoldingfor the holding, withSingleItemandSomeItemfor 1 vs many items.See libris/definitions#483