Valid UUID for iWork database items

Starting with [this post](https://apple.stackexchange.com/questions/452018/how-to-import-file-to-shape-in-pages) , I am trying to insert my own Shapes into Pages and one of the challenges is being to generate a valid [UUID](https://docs.oracle.com/en/database/other-databases/nosql-database/21.1/sqlreferencefornosql/using-uuid-data-type.html) for the identifier. I have tried UUID version 1, 3, 4 and 5, none of which Pages seems to recognize as a valid UUID. I learned that 3 and 5 can accept a namespace. So am wondering if there's a specific namespace that needs to seed the UUID when it's generated. Apple documents [it's own UUID](https://developer.apple.com/documentation/foundation/uuid) , which perhaps I could generate with X-Code, but I'm not sure. This is one of the Pages-generated UUID's:

9B7722F5-8029-4454-A8CA-AE6202BB5CA6 | my_shape

Any suggestions?