More precise KBV Item/Holding model#483
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…e-item
Make it possible to have linked SingleItem (sv: "Exemplar") inside Item hasComponent.
SingleItem is in collection none instead of hold so that we don't get any of the special handling for holdings
=> it is possible to have multiple SingleItem records per library
=> it is not involved in MARC export except as an embellished hasComponent of a regular holding record
Access control for holdings is extend to all subclasses of Item instead of just collection hold
i.e. only owning library + global registrant can write SingleItem
See also
libris/definitions#494
Later on Item might be replaced by ItemHolding for the holding, with SingleItem and SomeItem for 1 vs many items.
See libris/definitions#483
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Adjusting item model after recent discussion. The class HeldComponent represents a more abstract base for SingleItem, capturing inventory details (location, status, notes) for when the individual held item doesn't matter.
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Co-authored-by: Niklas Lindström <lindstream@gmail.com>
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Suggest that Item may be abstract (but not HeldComponent)
Co-authored-by: Niklas Lindström <lindstream@gmail.com>
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Justera beståndsmodellen för att skilja mellan innehav och dess komponenter. Beståndskomponenter kan vara logiska innehav (hylla, status, etc.), eller faktiska enskilda exemplar.
kbv:ItemHoldingblir en normaliserad nod (som principiellt "reifierar"kbv:heldBy).kbv:hasComponentfår domänkbv:ItemHoldingoch rangekbv:HeldComponent. Den kan då inte i sig vara ett bestånd (så vi tar bort den nuvarande (förvirrande men—som tur är—oanvända) möjligheten att ange rekursiva bestånd).kbv:HeldComponentär en konkret typ för komponenter av innehavet. Sådana kan, men måste inte, preciseras som faktiska exemplar (detta blir basklassen förkbv:SingleItem).Några frågor:
kbv:heldByska ha domainkbv:ItemHolding? (Möjligen inte, om vi vill härleda den från kedjan(kbv:heldBy kbv:hasComponent); för att ha en kompatibel, flexibel form i relation till BF & RDA. Men vi kan också göra en sådan härledning enbart förbf:heldBy, för att tydligt specialisera vår relation.)kbv:Itemkan görasptg:abstract; den är basklass för bestånd respektive exemplar. Men om vi vill göra en mjukare övergång kan vi avvakta med det (den är därför f.n. utkommenterad).