A cursor is a handle to a specific element in a collection.
A reference to the element pointed to by this cursor, as it was inserted into the collection.
Optional
Get a reference to the cursor that is immediately after this one.
If the collection does not specify an order, this method will not exist.
Generate all elements from this cursor till the end of the collection.
Get a reference to the cursor that is immediately before to this one.
Generate all elements from this cursor till the beginning of the collection.
A cursor is a handle to a specific element in a collection.