Items with more than one standard identifiers

[idolum]

In #380 and #413 various identifiers were added to the item.

In case of the epo-cat:hasStandardID, an item might have more than one standard identifier. For instance, a book might have a

• UPC (https://en.wikipedia.org/wiki/Universal_Product_Code) code and
• ISBN (https://en.wikipedia.org/wiki/ISBN) code

In this case, for the book two standard identifiers according to two different identification schemes have to be provided in a catalogue.

Proposed change:

Change cardinality to 0..*:

epo-cat:Item ---- epo-cat:hasStandardID -- 0..* --> adms:Identifier

[andreea-pasare]

[idolum]

@andreea-pasare Great! Thank you!