we have few document of DNG SDK. you may say the spec is enough though, for me, not.
i think sample code is the most useful explanation to use the SDK. i ve tried to search them but no code have been found.
in DNG SDK directory, there is a directory called project. in it, two version of project file(win & mac) are. this is a log to compile win version.
1. install Microsoft Platform SDK
2. get XMP SDK from http://www.adobe.com/devnet/xmp/ and expat from http://sourceforge.net/projects/expat/
3.place XMP SDK on dng_sdk_x_x
4.copy expat library on dng_sdk_x_x/XMP-SDK/third-party/expat/
5.set project property of include path. at this time, Microsoft Platform SDK path
6.add a link to uuid.lib. this also is on Microsoft Platform SDK.
I guess you can compile DNG SDK project. later