Newbie help: show vertex attributes

I’m using Blender to load Collada files that contain one position stream, one normal stream and one texcoord stream.
After import succeeded, I want to select a vertex and know its position (x,y,z), normal (x,y,z) and texcoord (u,v) values as specified in the original file.
How can I do this in Blender?

you can start with something like this:
http://www.pasteall.org/17123/python

shows up in the N-Panel in the 3dview