At ArcGIS Enterprise 10.9.1, named users in the Enterprise portal must be licensed with the ArcGIS Knowledge user type extension to create, edit, and update Knowledge Graph Server services. At ArcGIS Enterprise 11.0, your account no longer requires the ArcGIS Knowledge user type extension, but you must be signed in to the Enterprise portal to create, edit, and update Knowledge Graph Server services.
The fields resource allows you to access and edit properties of the entity types and relationship types defined as part of a knowledge graph service's data model resource. You can modify the properties associated with an existing type of graph item if you have sufficient privileges.
The response format. The only supported response format is html.
The following is a sample request URL to access fields associated with the data model resource's Warehouse entity type for a knowledge graph service named SupplyChain: