KDE, Gnome, and other Linux desktop environments, as well as applications in general require some fundamental open data to operate. The primary areas are:
There are existing projects internal and external to KDE that try to address these requirements and often duplicate each other in doing so, but they either have known issues or are deprecated in KDE Frameworks 5 (see individual areas detailed below).
It is proposed to develop a set of KDE Open Data file formats and Qt libraries to support these requirements. Rather than collating and curating our own data sources, we will use Wikidata as the primary source for all the required data and simply repackaged it into a format suitable for offline usage in a Linux distribution or standalone application installer. Where Wikidata lacks some data fields we require we will add these ourselves, but will work with Wikidata to have them incorporated upstream.
There will be two separate parts to this project:
This separation will allow distros to package the data separately and allow other desktop projects or applications not written using Qt/C++ to utilise the data without having to install the Qt libraries. It is hoped for these data files to become a shared common resource and so reduce duplication of effort and file space.
The initial products are proposed as:
OpenFlags is kept separate from OpenCodes to reduce the size of dependencies for most use cases. The OpenFlags data will mostly be accessed directly by apps using the standard icon theme facilities or loading an SVG directly from disk, but QCodes may provide API to return a QImage or a QPath.
In the future KDE may wish to offer a generic KWikiData library to allow applications such as Marble or KGeography to dynamically access a wider set of data, but this is outside the scope of this project.
See the KHolidays wiki page for more details.