range(location-set)
range-inside(location-set)
start-point(location-set)
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)
start-point()
except that it returns the
points immediately after each location in its input.