tag.
Any format is acceptable, but one would normally use the format current
at the time.
- (In LyX 2.1, the current layout format is 45.) You should be aware that local
+ (In LyX 2.1, the current layout format is 48.) You should be aware that local
layout is not supported by versions of LyX prior to 1.6, so you should not
use it if you want to be able to export your document to LyX 1.5 or earlier
(without, that is, losing the local layout information).