What is the full form for NDK as in cache.ndk in Lotus notes?

Lotus Notes File extension

What is the full form for NDK as in cache.ndk in Lotus notes?
Its Notes Database Design Elements
Reply:http://filext.com/file-extension/NDK
Reply:find in http://fileext.com

This website has all usefull extension's full name, its program etc.

NDK is short form of Notes Database Design Elements.

Company IBM. Result from fileext.com

Thanks.