Where are services that belong to a certain application stored? E.g., Make New Sticky Note or New BBEdit Document With Selection

Where are services that belong to a certain application stored? E.g., Make New Sticky Note or New BBEdit Document With Selection. They are not in /System/Library/Services nor in ~/Library/Services or in the application bundle. I have run opensnoop and launched Make New Sticky Note but opensnoop didn't return any relevant file i/o.