I am new to the Grakn ai, I was wondering can I have a relationship between two keyspaces?
Keyspaces are independent of each other. If you wanted to model any relationships between them you could so do by creating your own “meta” knowledge base which would contain your keyspaces as entities and then you could have relationships between them. This would only relate your keyspaces though, not the entities in them.
At this stage relationships between entities in different keyspaces are not supported.