How to indicate that specific sections of a page can be swiped

There are a lot of mobile UI design patterns that support swiping, and these are designed based on interaction and animation that indicate the behaviour. Examples include the 'swipe/pull down to refresh' and also the page flip when users swipe left or right.

I also know that there are some applications that show swiping interactions for only specific sections of a page, but I generally don't see any cues or hints to suggest that this behaviour is possible. An example of a discussion about this for Android applications here. Are these supposed to be discoverable interactions or are there some standard notations for this type of behaviour?