select points of polygons

Hi there,

I have polygons with 5 points (left, center, right, top, bottom)

Now I would like to select an individual point out of the polygon. Are there any functions to provide this in an readable manner other than:

e.g. SELECT replace(split_part(p::text,',(',1),'((','(')::point as point FROM (
SELECT '((0.001329116037,0.007391900417),(0.001371765621,0.1608393682),(0.1502391498,0.00733744679),(0.001500387404,-0.1468751078),(-0.1472653422,0.007425591447))'::polygon as p) as poly

è (0.001329116037,0.007391900417)

Thanks
Andreas

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