The outcome of looking up part of a link, such as the name or the URL of the item it points at.
A lookup that produced something returns it as value. A lookup that could not be performed
returns error, which marks the value as still unknown so it is looked up again. A lookup that
was performed but has nothing to show returns neither, which settles the value as absent.
The outcome of looking up part of a link, such as the name or the URL of the item it points at.
A lookup that produced something returns it as
value. A lookup that could not be performed returnserror, which marks the value as still unknown so it is looked up again. A lookup that was performed but has nothing to show returns neither, which settles the value as absent.