Usually this method is called by kinds after creating a corresponding type. Therefore it is usually not needed to call this method in an other context.
the new type
Optionalkey: stringan optional key to register the type, since it is allowed to register the same type with different keys in the graph
When removing a type/node, all its edges (incoming and outgoing) are removed as well. Design decision: This is the central API call to remove a type from the type system in case that it is no longer valid/existing/needed. It is not required to directly inform the kind of the removed type yourself, since the kind itself will take care of removed types.
the type to remove
Optionalkey: stringan optional key to register the type, since it is allowed to register the same type with different keys in the graph
Each Typir instance has one single type graph. Each type exists only once and is stored inside this type graph.
Edges with different meaning/purpose will exist in parallel inside the same graph, otherwise nodes/types need to be duplicated or would be used in multiple graphs. Graph algorithms will need to filter the required edges regarding $relation.