I use two programs (not from adobe) that write sidecar files for image files. These <image file name>.xmp sidecar files look almost identical for the same image so I bet that there is a standard where the format is defined. I need to write SideCar files myself and the SDK does not help. I can't find any XML schema definition file for those sidecar files. I downloaded the XMP-Toolkit-SDK-CS6 and the XMP-FileInfo-SDK-CS6 but didnot find any XSD file.
Can somebody help?