One phrase to look for is “open-world” or “open-universe”, in which it isn’t known which objects exist. See e.g. this paper. That said, this is still in the realm of PPLs—to my knowledge this was developed for BLOG, and then spread to other PPLs.
One phrase to look for is “open-world” or “open-universe”, in which it isn’t known which objects exist. See e.g. this paper. That said, this is still in the realm of PPLs—to my knowledge this was developed for BLOG, and then spread to other PPLs.