Leuven, E. wrote:
> ...i would expect this to be pretty rare, so would rather suggest a --spitz
> switch ;-)

--ed ist shorter ;-)

> more seriously, when would one need backward output compatibility?
>
> i can think of a scenario when working with a co-author who doesn't have
> the latest lyx installed.
>
> when working on a document i think you'd like what jmarc calls "semantical"
> compatibility.
>
> and when you're done, the person with lyx 1.1 does the final formatting and
> that would show fine in your (later version of) lyx since this would be
> covered by forward output compatibility which we obviously want

Just two scenarios which I more or less found myself into in the past: 

1. While working on a book, I switch to the newly released LyX 1.5.0. Just 
before finishing, however, I notice that LyX 1.5 has a bug that forces me to 
return to 1.4.5.1. My publisher has already approved the layout, but I need 
to make some final editions and send the reworked PDF (which must not exceed 
the agreed number of pages and which must maintain the page breaks).

2. On my university desktop, the LyX installation always lags behind, because 
the applications are installed network-wide. Often, a previous major release 
is installed. I'm working on a book that needs to be sent out tomorrow, and 
after some final editing, I want to print it out on the institute's printer. 
As usual, I have my laptop with me, which has the recent version of LyX. But 
then, my laptop refuses to work. Now I need to make an identical printout via 
LyX 1.4.5.1 instantly.

Jürgen

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