They are certainly contemporary; but as well as depicting ordinary life as we know it (school, teachers, holidays, home, parents, siblings etc), they also conjure a fantasy world of magical powers and beneficent/malicious creatures; and they are not even just children's books, since mums and dads (and people on the train) read them too!
our genre categorisation scheme is likely to be refined in subsequent versions of the corpus, since the ACC is an ongoing project.