What is our plan for Qt6 and QXmlPatterns?

Helio Chissini de Castro helio at kde.org
Thu Oct 28 07:32:45 BST 2021

Hi Albert

Can i raise the questions on all valid possible solutions ?

- Maintain qxmlpattern on our side
- Move to libxslt
- Move away from Xml

The first one is easy from the point of view of applications, but we don't
know how much maintenance towards qt6 will be considering.

The second one is a little more complex from the point of view of
applications, some for buildsystem as well, but then we will use a library
that is already proven everywhere and don't need to maintain and can
consider API stable enough.

The third one, more unlikely but valid,  is to understand why we are using
XmlPatterns and if we can't replace it with something more modern for the
"6" interaction of frameworks/plasma. Is some new development and will
introduce a lot of new things to thought, but then, still a valid


On Thu, Oct 28, 2021 at 12:31 AM Albert Astals Cid <aacid at kde.org> wrote:

> QXmlPatterns has been deprecated for a long time and the current plan is
> that there will no Qt6 release of it.
> We use it in quite some places
> https://lxr.kde.org/search?%21v=kf5-qt5&_filestring=CMakeLists.txt&_string=XmlPatterns
> For those that don't want to click the link
>         artikulate
>         cantor
>         digikam
>         gcompris
>             Maybe not?
> https://invent.kde.org/education/gcompris/-/merge_requests/89
>         kbibtex
>         kdav
>         kdav2
>         kig
>         ktouch
>         rocs
>         syntax-highlighting
>         kdepim-runtime
>         kipi-plugins
>         massif-visualizer
>             Maybe not?
> https://invent.kde.org/sdk/massif-visualizer/-/merge_requests/3
> It's not a whole lot of apps, but it's a considerable number.
> The suggested solution by The Qt Project seems to be migrate to something
> like libxslt.
> Has anyone have any experience with that?
> Could we create some kind of wrapper so we would not have to port all
> those apps one by one?
> Another potential solution is us "adopting" QtXmlPatterns and porting it
> to Qt6, the code is said to be a bit of a nightmare and basically
> unmaintainable, that's why The Qt Project doesn't want to have a Qt6
> version, but given we don't have commitments like commercial support for
> our things, we could probably get away with a "we did this for ourselves,
> you should really not use it" statement.
> Any other ideas?
> Cheers,
>   Albert
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