[Tads3] knowledge / 'seen' / npc knowledge base

["Eric Eve" <eric.eve@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Steve Breslin wrote:

> Is there a programmatic reason we have two concepts for PC knowledge,
> 'knowledge' and 'seen'? Would it be desirable to collapse these two
> into one term? Are any objects both seeable and knowable, such that
> the one doesn't necessarily imply the other?

[snip]

> Does this seem like a worthwhile simplification, or am I missing some
> subtlety which precludes this?

One reason that springs to mind for distinguishing between known and seen
might be in connexion with the hints system; for example a goal might become
open on the PC's becoming aware of the existence of an item (known) and
closed when the PC physically finds it (seen). I can also imagine situations
where one might want to preserve this distinction in the isActive condition
of TopicEntrys, where what the PC asks may be different if s/he has actually
seen an object from what it would be if s/he had merely heard about about.

-- Eric