jar 25=planes over 5,700 kg MTOW
jar 23=planes under 5,700 kg MTOW
jar 27= small rotorcraft
jar 29= large rotorcraft
you ask about sep(land) it speaks for itself its a single engine piston land plane
you could check
http://www.jaa.nl/index.html dont know if they list all the regulations there though
i think this might be jar 23 ,172 pages of fun reading
jar 23