I see that I have com.sun.media.sound
package withing rt.jar
file of my jdk1.6.0_25
distribution. But I see no javadocs for it in here: http://docs.oracle.com/javase/6/docs/api/
What is the role of this package? What is it part of? I can find some javadocs for it with Google (like here http://www.docjar.com/docs/api/com/sun/media/sound/package-index.html), but how to know which is correct for SE 6? Why doesn't it docummented in main javadoc?
EDIT
So, I understand that they are not of public API, but what they are used for? Why do they documented in openjdk javadoc? Are they public there?
These classes are proprietary and internal, they are not intended for public use. They are also a subject to change in the future. Close your eyes, don't look at them and never use them.