range(location-set) The range is the minimum range necessary to cover the entire location.
range-inside(location-set) Returns a location set containing the interiors of each of the locations in the input.
start-point(location-set) Returns a location set that contains
one point representing the first point of each location in
the input location set.
For example,
start-point(//PERSON[1])
Returns the point immediately before the first PERSON element.
start-point(//PERSON)
returns the set of points immediately before each PERSON element.
end-point(location-set) The same as start-point() except that it returns the
points immediately after each location in its input.