Hi everyone,
we are currently in the process of standardizing a new "Keywords" key in the freedesktop.org desktop entry spec[0].
Apparently KDE used to use a slightly different variant (using commas instead of semi-colons as separators) before it was prefixed with X-KDE. It was agreed that the differences are too minor to matter in practice, but as the Trinity desktop still uses the non-prefixed variant, it seemed like a good idea to make you aware of the spec change anyway :)
Regards, Florian
[0] http://lists.freedesktop.org/archives/xdg/2011-December/012173.html