[osmosis-dev] NKV vs WKV

[Dave F]

Hi

Thanks to Frederik for his reply to my previous Q.

My next one:
I have this Stations_Platforms_Old.osm file. It contains nodes of 
railway=station entities & way/rels of railway=platform entities.

As I would expect, this command returns only the stations:
osmosis.bat --read-xml-change Stations_Platforms.gz --rx 
Stations_Platforms_Old.osm --ac --nkv keyValueList=railway.station --wx 
Stations_Platforms_New.osm

However this command returns both the platforms and the stations:
osmosis.bat --read-xml-change Stations_Platforms.gz --rx 
Stations_Platforms_Old.osm --ac --wkv keyValueList=railway.platform --wx 
Stations_Platforms_New2.osm

Why doesn't it remove the platforms? How do I return only the platforms?

Cheers
DaveF