Re: What are those enumerations after the breadcrumb's :: called?

For some enumerations, the instances are defined as part of schema.org.

The values of these enumerations can be found by looking for individuals in
the canonical RDFa whose type is the enumeration, rather than being classes
or properties [ignore True and False].

Other enumerations do not have values defined in schema.org, but instead
make use of external sources of values. In some cases, the IRIs of the
values are contained in the rdfs comment.

In other cases, the comment contains the URL for a website that can be used
as a source of values. There is no algorithmic mechanism for obtaining the
values of this kind of Enumeration.

Most enumerations classes are direct subclasses of Enumeration. The main
exception is MedicalEnumeration, which is a subclass of Enumeration, but
which has no direct instances.

Enumerations can be closed (only listed values may be permitted), or
semi-open  (values other than those listed may be permitted but may not be
understood). This is not always formally stated.

Enumeration values are instances of the given enumeration class (and are
thus implicitly Things and Intangibles).  In some cases the values might be
classes; however these classes are not subclasses of the Enumeration class.

Thus, http://schema.org/Virus is an intangible, but if it were made a real
class, it would not have instances that were intangible.

[Ignore True and False].

Simon
P. S.
My reason for ignoring True and False is that they are the only things in
schema that are not declared to be classes, but which have subClassOf
assertions (and which are the only triples that my sdo parser doesn't
consume, so they keep generating warnings).