. All type 3 questions (linkage-dominant) seek to contextualise instances or values
through the discovery of interconnections to any recorded instances in the
universe of discourse, regardless of connection type (limitations as to which links
are of interest can be added as an additional constraint). Discovered instances
can be returned directly, while discovered values must be mediated to instances.
Type 3 questions present as a key comprising a pair of a designator of which one
of instance or value has been presented, and either an instance or a value as
appropriate, and seek either confirmation of existence of any connection to key,
or a graph structure containing a map of the network of discovered values.