The active portal account must be licensed with the ArcGIS Knowledge user type extension to use Knowledge Graph Server services.
The domains resource is available for a knowledge graph service's data model resource. You can modify the collection of domains associated with the data model to define the content that can be provided in the property of an entity or relationship.
The response format. The only supported response format is html.
The following is a sample request URL used to get information about the domains associated with the data model resource for a knowledge graph service named SupplyChain: