Wikidata:WikiProject sum of all paintings/Add inventory numbers
Help us add inventory numbers to these paintings as part of Sum of all paintings and to help Wikidata:WikiProject sum of all paintings/Missing inventory numbers.
Every museum keeps track of the works in their collection and assign these works inventory numbers (also called accession number). These are unique identifiers in the museum collection. We also store these inventory numbers using the property inventory number (P217). We do this so that instead of creating a duplicate new item, we can expand on existing items. The inventory number is always qualified with collection (P195) because the inventory number is unique in a museum collection, but multiple museums might be using the same identifier.
Add inventory number
It's easiest to work on a per museum basis to find missing inventory numbers. In one window you keep the list of items without an inventory number and in another window the museum (collection) website. For every item that doesn't have an inventory number:
- Take an item for a painting that doesn't have an inventory number (Girl with a Red Hat (Q614047))
- Find the work on the museum website (http://www.nga.gov/content/ngaweb/Collection/art-object-page.60.html)
- A good trick is to look at the image or linked articles if these already have a link to the museum website (the image has a link in this example)
- Copy the inventory number ("1937.1.53")
- Add the inventory number (P217) and qualify it with the collection (P195) (inventory number (P217) -> "1937.1.53" with collection (P195) -> National Gallery of Art (Q214867), diff)
- We're done, but to make it even better it's good to add a reference
- Copy the url at the museum website. Check if the museum website offers a "permalink", if that's the case, use that url
- Click "add reference"
- Choose reference URL (P854) and paste the url (reference URL (P854) -> "http://www.nga.gov/content/ngaweb/Collection/art-object-page.60.html")
- Click "Add" (not "Add reference")
- Choose retrieved (P813) and add what date it is (retrieved (P813) -> "2015-05-14")
- Click "save" to finish
It's easiest to work on a per collection basis. On Wikidata:WikiProject sum of all paintings/Missing inventory number and linked pages you can find collections to work on.
While adding inventory numbers you might run into some problems. This lists some of them and the best step to take
Multiple painting versions
A lot of artists like to make multiple version of the same paintings. Our goal is to create a separate item for each of the versions. Some items will be about multiple paintings. You'll notice the multiple collection statements. Do not add the inventory number, instead replace instance of (P31) -> painting (Q3305213) with instance of (P31) -> painting series (Q15727816). A separate documentation page will be created how to model these kind of situations.
Spread out works
A diptych (Q475476) or a polyptych (Q1278452) consist of multiple works. Sometimes these stay together and get assigned one inventory number (that's easy!), but sometimes these get spread out all over the world. We approach in a similar way as the multiple painting versions. Do not add the inventory number, instead replace instance of (P31) -> painting (Q3305213) with instance of (P31) -> painting series (Q15727816). A separate documentation page will be created how to model these kind of situations.
Also confer Wikidata:WikiProject Visual arts/Item structure#Individual objects and parts for this problem!
Can't find the painting
You searched the collection, but you can't find the painting. Don't worry about that. Maybe someone added the wrong collection or it's listed in the collection under a completely different name. Other option is that the museum recently acquired the work and the website is not up to date. Just skip it. We might end up creating a duplicate item, but we can always merge that later.
No longer in the collection
The museum used to have a work, but it's no longer in there and it's not listed on their website. Don't remove the collection (P195) statement! Instead, qualify it with end time (P582) to indicate when it was no longer in the collection.