query value/transient composite? objects vs values?

[zhuangmz08]

Hi, I'm confused with value/transient/entity composite, my question is,
I can get entities after I fire a query using query-API inside a UnitOfWork.
1. Can I get value composite by query API? If I cannot, value is persistentable 
only in a Entity?
2. Can I query transient? I guess not.
3. module.values()/.entities()/.transients()/.services()/.configurations() is 
used to declare those 5 types of composite. Then, what does module.objects() 
mean?
Thanks a lot.