You may create empty collections if you wish, but creating an entity of a new type will automatically create a corresponding collection for you.For example, creating a new custom “item” entity, creates an “items” collection.You must then index the collection for changes to be updated in the collection.(Changes do not have to be approved.) For more information, see the tutorial Using the World Cat Digital Collection Gateway.The most recent games I've obtained do not show up in my collection -- or in the "Owned" section of the app I'm using) -- such as Sid Meier's Civilization: A New Dawn and Puerto Rico.I've confirmed both on the game pages and checked the filter settings on the Collection page. Fixed, was a combination browser refresh and app reinstall issue.
When your collection is harvested and synchronized with World Cat, OCLC numbers are added to the World Cat record for each item.
For more on creating entities, see Creating Custom Data Entities settings resource, then doing an HTTP GET on that URI will yield the normal Collection resource.
For example here a request and respinse for settings for the Collection “battles”, which does not yet have Indexing is expensive and now it can be done selectively.
The Digital Collection Gateway then alerts your CONTENTdm Server that new OCLC numbers have been added.
We recommend that you update your collections with the OCLC numbers to provide a logical link between World Cat records and your CONTENTdm metadata.