* A single character may contain more than one collation element.
* @param elems The UCollationElements containing the text.
* @param status A pointer to a UErrorCode to receive any errors.
* A single character may contain more than one collation element.
* @param elems The UCollationElements containing the text.
* @param status A pointer to a UErrorCode to receive any errors.
* a U_BUFFER_OVERFLOW_ERROR is returned if the internal stack
* buffer has been exhausted.
* @return The previous collation elements ordering, otherwise returns
* a U_BUFFER_OVERFLOW_ERROR is returned if the internal stack
* buffer has been exhausted.
* @return The previous collation elements ordering, otherwise returns