Rekordbox Cue Storage Format - Holzhaus/mixxx GitHub Wiki
RekordBox can export it's proprietary database (.edb files) as XML to store its cue points.
Hotcue start and stop offset is decimal seconds, type=0 is hotcue and type=4 is a loop.
Example XML with one exported song is available from
http://tuohela.net/irc/rekordbox.xml
Rekord Buddy: a proprietary program that syncs RekordBox and Traktor libraries