What is container short-landed and over-landed?

http://www.cnsonline.net/newsletter.asp?ID=50&issue=01/03/2005

From the website:
If a container does not actually arrive on the vessel it has been manifested for it is described as ‘shortlanded’.
If the box is still to arrive, but at a later date, the shortlanded record can be left as it is. When the box arrives on the new vessel it is described as ‘overlanded’.

Overlanded – When a container is suppose to be exported to Shanghai but the container overlanded in Chiwan.
Overlanded – If the container number is wrong, the discharging port will claim that the wrong container as shortlanded while the correct one is overlanded since it is not declared in the container list.