[translations] Text between braces {}

[Khaldoon Sinjab]

Hi,

How should the text between braces {} be translated? For example, in 
general.pot file in drupal-pot-6.x-1.0-rc1.tar there is this string:

Primary Key: The {node}.vid of the node.

Should I leave "{node}.vid" as it is? Or should I translate it? How does 
it appear in the first place? Will "{node}.vid" be replaced with 
something else?

Thanks,
Khaldoon Sinjab