To specify a range, you append
/range-to(end-point)
to a locaiton path specifying the start point of the range. The
parentheses contain a location path specifying the endpoint
of the range. For example, suppose you want to select everything
between the first PERSON element and the last
PERSON element
xpointer(/child::PERSON[position() = 1]/range-to(/child::PERSON[position() = last()]))