support the notion of attributes.
These may be unary (e.g., "X is green")
or binary (e.g., "X weighs 3.14 pounds").
In either case, no other entity is involved.
In Ontiki, attributes are treated as simple forms of relationships.
Once a class of relationships has been defined
and authorized for a class of entities,
an instance of the relationship
may be selected for an instance of an entity.
Typed Links
Many semantic wikis support a simplified form of
Resource Description Framework (RDF),
in which the current page and a link target (i.e., href)
serve as the subject and object
of a triple.
An added "type" is then used as the predicate.
Ontiki will recognize this notation,
but will classify the resulting relationships
in a manner that keeps them from interfering
with other, formally defined relationships.