From a Many-to-One set, any element is equal to another element in the same set. So, you need to define the conditions on the set.
Larry Masinter wrote:
Re: Many-to-One vs One-to-One
I think the question is ill-formed; it assumes that the space of resources has a well defined equality relationship.
Before you can ask if there are two URIs U1 and U2 such
that U1 != U2 but ResourceIdentifiedBy(U1) == ResourceIdentifiedBy(U2)
you have to know what '==' means for resources. But there is no well-defined equality for resources, so the question doesn't make sense.
many-to-one and one-to-one only apply to spaces with well-defined (and, for that matter, unique) equality relationships.
Larry
