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).
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).