Gets the child elements that were added to the given parent element.

  Gets the child elements that were added to the given
parent element. The element array returned is in the
order that the elements lie in the document, and must
be contiguous.
Returns: the child elements

  Gets the child elements that were removed from the given parent element.

  Gets the child elements that were removed from the
given parent element. The element array returned is
sorted in the order that the elements used to lie in
the document, and must be contiguous.
Returns: the child elements

  Returns the element represented.

  Returns the element represented. This is the element
that was changed.
Returns: the element

  Fetches the index within the element represented.

  Fetches the index within the element represented.
This is the location that children were added
and/or removed.
Returns: the index >= 0