Parent-child Functions

These functions help flatten a parent-child hierarchy into a regular hierarchy.

Function	Description
PATH	Returns a string which contains a delimited list of IDs, starting with the top/root of a hierarchy and ending with the specified ID.
PATHCONTAINS	Returns TRUE if the specified Item exists within the specified Path.
PATHITEM	Returns the nth item in the delimited list produced by the Path function.
PATHITEMREVERSE	Returns the nth item in the delimited list produced by the Path function, counting backwards from the last item in the path.
PATHLENGTH	Returns returns the number of items in a particular path string. This function returns 1 for the path generated for an ID at the top/root of a hierarchy.

Contributors: Alberto Ferrari, Marco Russo

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