Slash character in rdf:ID

Is one allowed to use slashes in an rdf:ID?

  <owl:Class rdf:ID="foo/Bar"/>

The intended interpretation is that "foo/Bar" is a local name, in the
namespace defined by xml:base. I suspect that some tools may get into
trouble when trying to describe instances without using an rdf:type
element:

  <foo/Bar rdf:ID="b1"/>