The latter sentence refers to children in general, perhaps all or most of them.

It looks like some sentences are referring to an image, but I don't see any images.

Facts may also be understood as those things to which a true sentence refers.

It is to this that the following sentence refers.

It usually follows, but sometimes precedes, the sentence referred to.

The second sentence is referring to a future heat wave that is not specific.

And in the very next sentence refers to me as a perfect guffin.

So, when one sentence refers to the truth-value of another, it is semantically higher.

The sentence referring to Christmas is obscured by laughter.

The sentence is referring primarily to the OS and stock browser, however.