A Container which is a container of Items, each of which describes a thing which has been read or has been suggested for reading.

is a bit ambivalent whether the Items which a Reading List is a container of are themselves the things which have been read or have been suggested for reading, or if they merely describes them. This ontology takes the latter approach, primarily because it is not clear that all readable things are necessarily themselves Items.

The Items describing readable things are not themselves given a more specific type by .