[Qgis-developer] About project.qgs file versions

[Nathan Woodrow]

Are you sure you can't open it in older versions? I mix project versions a
far bit and never seem to have any issues.  Some styling options etc might
not load right but it should still open at least.

On Tue, 25 Oct 2016 11:10 pm Paulo van Breugel <p.vanbreugel at gmail.com>
wrote:

> On 25-10-16 13:56, Matthias Kuhn wrote:
> > Hi
> >
> >> Oh yes, it's true !    You are right.   I tested.     :(
> >>
> >> So I am asking: what is the reason why we did this  ?
> >>
> >> What you call "feature" is a problem for all those who need to share
> >> data with users who have an older version of QGIS, for one reason or
> >> another.
> >>
> >> I am wrong ?   What do you think ?
> >>
> >> Regards
> >> Geo
> >>
> > Nothing has been explicitly done to prevent it.
> >
> > The "feature" is a warning which you can interpret as "It might or might
> > not work in your scenario. Before you rely on backporting projects in
> > production scenarios, test it carefully.".
> > Or test one version and stick to that within a project which is the
> > safest choice.
> >
> > Changing this behavior would be a considerable additional amount of work
> > and slow down development of new features (and there would still be no
> > guarantee).
> To state it perhaps more explicitly, this is not a 'feature'. It is a
> 'consequence' of the development or improvements of features in QGIS.
> This is basically a choice that has between made to avoid spending too
> much time on making project (.qgs) files back-ward compatible, as
> explained by Matthias. This may indeed be a problem for users (it has
> been for me in the past). But QGIS does provide a clear warning that
> your project files may not be backward compatible, to help users to run
> into problems later. It would have been nice to have some form of
> backward compatibility, but I understand why this may not be feasible,
> and I am happy I am being warned in advance.
>
> >
> > Regards
> > Matthias
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