id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
9011	consider changing preset value of classic;skating to classic+skating	aceman	team	"This can be found in:
<item name=""Skiing"" icon=""presets/skiing_downhill.png"" type=""node,way,closedway"">
<link href=""http://wiki.openstreetmap.org/wiki/Proposed_features/Piste_Maps""/>
<key key=""sport"" value=""skiing"" />
<combo key=""piste:grooming"" text=""Grooming"" values=""classic,mogul,skating,classic;skating,scooter,backcountry"" />

The wiki http://wiki.openstreetmap.org/wiki/Key:piste:grooming says classic;skating is deprecated. Taginfo seems to confirm the version classic+skating is used more: http://taginfo.openstreetmap.org/keys/piste%3Agrooming#values .
I don't know the reasoning, they seem the same to me semantically (';' is used for multiple values in a key, and that seems to be the case here)."	enhancement	new	minor		Internal preset	tested